update node_modules

107 files changed, 217 insertions, 12829 deletions

diff --git a/node_modules/.yarn-integrity b/node_modules/.yarn-integrity
index 03fe7e255..57a73e7ba 100644
--- a/node_modules/.yarn-integrity
+++ b/node_modules/.yarn-integrity
@@ -1 +1 @@
-ca329880347821f4c79e08f03cb2dec9f637cb874882baac0af4bf4ab68d0362
\ No newline at end of file
+71a595d8819c141a8c9cb0787566aceeaaefb2b47317b30f3c9fbbfa9a25eb49
\ No newline at end of file
diff --git a/node_modules/bl/node_modules/readable-stream/.npmignore b/node_modules/bl/node_modules/readable-stream/.npmignore
deleted file mode 100644
index 38344f87a..000000000
--- a/node_modules/bl/node_modules/readable-stream/.npmignore
+++ /dev/null
@@ -1,5 +0,0 @@
-build/
-test/
-examples/
-fs.js
-zlib.js
\ No newline at end of file
diff --git a/node_modules/bl/node_modules/readable-stream/.travis.yml b/node_modules/bl/node_modules/readable-stream/.travis.yml
deleted file mode 100644
index 1b8211846..000000000
--- a/node_modules/bl/node_modules/readable-stream/.travis.yml
+++ /dev/null
@@ -1,52 +0,0 @@
-sudo: false
-language: node_js
-before_install:
-  - npm install -g npm@2
-  - npm install -g npm
-notifications:
-  email: false
-matrix:
-  fast_finish: true
-  allow_failures:
-    - env: TASK=browser BROWSER_NAME=ipad BROWSER_VERSION="6.0..latest"
-    - env: TASK=browser BROWSER_NAME=iphone BROWSER_VERSION="6.0..latest"
-  include:
-  - node_js: '0.8'
-    env: TASK=test
-  - node_js: '0.10'
-    env: TASK=test
-  - node_js: '0.11'
-    env: TASK=test
-  - node_js: '0.12'
-    env: TASK=test
-  - node_js: 1
-    env: TASK=test
-  - node_js: 2
-    env: TASK=test
-  - node_js: 3
-    env: TASK=test
-  - node_js: 4
-    env: TASK=test
-  - node_js: 5
-    env: TASK=test
-  - node_js: 5
-    env: TASK=browser BROWSER_NAME=android BROWSER_VERSION="4.0..latest"
-  - node_js: 5
-    env: TASK=browser BROWSER_NAME=ie BROWSER_VERSION="9..latest"
-  - node_js: 5
-    env: TASK=browser BROWSER_NAME=opera BROWSER_VERSION="11..latest"
-  - node_js: 5
-    env: TASK=browser BROWSER_NAME=chrome BROWSER_VERSION="-3..latest"
-  - node_js: 5
-    env: TASK=browser BROWSER_NAME=firefox BROWSER_VERSION="-3..latest"
-  - node_js: 5
-    env: TASK=browser BROWSER_NAME=ipad BROWSER_VERSION="6.0..latest"
-  - node_js: 5
-    env: TASK=browser BROWSER_NAME=iphone BROWSER_VERSION="6.0..latest"
-  - node_js: 5
-    env: TASK=browser BROWSER_NAME=safari BROWSER_VERSION="5..latest"
-script: "npm run $TASK"
-env:
-  global:
-  - secure: rE2Vvo7vnjabYNULNyLFxOyt98BoJexDqsiOnfiD6kLYYsiQGfr/sbZkPMOFm9qfQG7pjqx+zZWZjGSswhTt+626C0t/njXqug7Yps4c3dFblzGfreQHp7wNX5TFsvrxd6dAowVasMp61sJcRnB2w8cUzoe3RAYUDHyiHktwqMc=
-  - secure: g9YINaKAdMatsJ28G9jCGbSaguXCyxSTy+pBO6Ch0Cf57ZLOTka3HqDj8p3nV28LUIHZ3ut5WO43CeYKwt4AUtLpBS3a0dndHdY6D83uY6b2qh5hXlrcbeQTq2cvw2y95F7hm4D1kwrgZ7ViqaKggRcEupAL69YbJnxeUDKWEdI=
diff --git a/node_modules/bl/node_modules/readable-stream/.zuul.yml b/node_modules/bl/node_modules/readable-stream/.zuul.yml
deleted file mode 100644
index 96d9cfbd3..000000000
--- a/node_modules/bl/node_modules/readable-stream/.zuul.yml
+++ /dev/null
@@ -1 +0,0 @@
-ui: tape
diff --git a/node_modules/bl/node_modules/readable-stream/LICENSE b/node_modules/bl/node_modules/readable-stream/LICENSE
deleted file mode 100644
index e3d4e695a..000000000
--- a/node_modules/bl/node_modules/readable-stream/LICENSE
+++ /dev/null
@@ -1,18 +0,0 @@
-Copyright Joyent, Inc. and other Node contributors. All rights reserved.
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to
-deal in the Software without restriction, including without limitation the
-rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
-sell copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
-FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
-IN THE SOFTWARE.
diff --git a/node_modules/bl/node_modules/readable-stream/README.md b/node_modules/bl/node_modules/readable-stream/README.md
deleted file mode 100644
index 86b95a3bf..000000000
--- a/node_modules/bl/node_modules/readable-stream/README.md
+++ /dev/null
@@ -1,36 +0,0 @@
-# readable-stream
-
-***Node-core v5.8.0 streams for userland*** [![Build Status](https://travis-ci.org/nodejs/readable-stream.svg?branch=master)](https://travis-ci.org/nodejs/readable-stream)
-
-
-[![NPM](https://nodei.co/npm/readable-stream.png?downloads=true&downloadRank=true)](https://nodei.co/npm/readable-stream/)
-[![NPM](https://nodei.co/npm-dl/readable-stream.png?&months=6&height=3)](https://nodei.co/npm/readable-stream/)
-
-
-[![Sauce Test Status](https://saucelabs.com/browser-matrix/readable-stream.svg)](https://saucelabs.com/u/readable-stream)
-
-```bash
-npm install --save readable-stream
-```
-
-***Node-core streams for userland***
-
-This package is a mirror of the Streams2 and Streams3 implementations in
-Node-core, including [documentation](doc/stream.markdown).
-
-If you want to guarantee a stable streams base, regardless of what version of
-Node you, or the users of your libraries are using, use **readable-stream** *only* and avoid the *"stream"* module in Node-core, for background see [this blogpost](http://r.va.gg/2014/06/why-i-dont-use-nodes-core-stream-module.html).
-
-As of version 2.0.0 **readable-stream** uses semantic versioning.  
-
-# Streams WG Team Members
-
-* **Chris Dickinson** ([@chrisdickinson](https://github.com/chrisdickinson)) <christopher.s.dickinson@gmail.com>
-  - Release GPG key: 9554F04D7259F04124DE6B476D5A82AC7E37093B
-* **Calvin Metcalf** ([@calvinmetcalf](https://github.com/calvinmetcalf)) <calvin.metcalf@gmail.com>
-  - Release GPG key: F3EF5F62A87FC27A22E643F714CE4FF5015AA242
-* **Rod Vagg** ([@rvagg](https://github.com/rvagg)) <rod@vagg.org>
-  - Release GPG key: DD8F2338BAE7501E3DD5AC78C273792F7D83545D
-* **Sam Newman** ([@sonewman](https://github.com/sonewman)) <newmansam@outlook.com>
-* **Mathias Buus** ([@mafintosh](https://github.com/mafintosh)) <mathiasbuus@gmail.com>
-* **Domenic Denicola** ([@domenic](https://github.com/domenic)) <d@domenic.me>
diff --git a/node_modules/bl/node_modules/readable-stream/doc/stream.markdown b/node_modules/bl/node_modules/readable-stream/doc/stream.markdown
deleted file mode 100644
index 0bc3819e6..000000000
--- a/node_modules/bl/node_modules/readable-stream/doc/stream.markdown
+++ /dev/null
@@ -1,1760 +0,0 @@
-# Stream
-
-    Stability: 2 - Stable
-
-A stream is an abstract interface implemented by various objects in
-Node.js. For example a [request to an HTTP server][http-incoming-message] is a
-stream, as is [`process.stdout`][]. Streams are readable, writable, or both. All
-streams are instances of [`EventEmitter`][].
-
-You can load the Stream base classes by doing `require('stream')`.
-There are base classes provided for [Readable][] streams, [Writable][]
-streams, [Duplex][] streams, and [Transform][] streams.
-
-This document is split up into 3 sections:
-
-1. The first section explains the parts of the API that you need to be
-   aware of to use streams in your programs.
-2. The second section explains the parts of the API that you need to
-   use if you implement your own custom streams yourself. The API is designed to
-   make this easy for you to do.
-3. The third section goes into more depth about how streams work,
-   including some of the internal mechanisms and functions that you
-   should probably not modify unless you definitely know what you are
-   doing.
-
-
-## API for Stream Consumers
-
-<!--type=misc-->
-
-Streams can be either [Readable][], [Writable][], or both ([Duplex][]).
-
-All streams are EventEmitters, but they also have other custom methods
-and properties depending on whether they are Readable, Writable, or
-Duplex.
-
-If a stream is both Readable and Writable, then it implements all of
-the methods and events. So, a [Duplex][] or [Transform][] stream is
-fully described by this API, though their implementation may be
-somewhat different.
-
-It is not necessary to implement Stream interfaces in order to consume
-streams in your programs. If you **are** implementing streaming
-interfaces in your own program, please also refer to
-[API for Stream Implementors][].
-
-Almost all Node.js programs, no matter how simple, use Streams in some
-way. Here is an example of using Streams in an Node.js program:
-
-```js
-const http = require('http');
-
-var server = http.createServer( (req, res) => {
-  // req is an http.IncomingMessage, which is a Readable Stream
-  // res is an http.ServerResponse, which is a Writable Stream
-
-  var body = '';
-  // we want to get the data as utf8 strings
-  // If you don't set an encoding, then you'll get Buffer objects
-  req.setEncoding('utf8');
-
-  // Readable streams emit 'data' events once a listener is added
-  req.on('data', (chunk) => {
-    body += chunk;
-  });
-
-  // the end event tells you that you have entire body
-  req.on('end', () => {
-    try {
-      var data = JSON.parse(body);
-    } catch (er) {
-      // uh oh!  bad json!
-      res.statusCode = 400;
-      return res.end(`error: ${er.message}`);
-    }
-
-    // write back something interesting to the user:
-    res.write(typeof data);
-    res.end();
-  });
-});
-
-server.listen(1337);
-
-// $ curl localhost:1337 -d '{}'
-// object
-// $ curl localhost:1337 -d '"foo"'
-// string
-// $ curl localhost:1337 -d 'not json'
-// error: Unexpected token o
-```
-
-### Class: stream.Duplex
-
-Duplex streams are streams that implement both the [Readable][] and
-[Writable][] interfaces.
-
-Examples of Duplex streams include:
-
-* [TCP sockets][]
-* [zlib streams][zlib]
-* [crypto streams][crypto]
-
-### Class: stream.Readable
-
-<!--type=class-->
-
-The Readable stream interface is the abstraction for a *source* of
-data that you are reading from. In other words, data comes *out* of a
-Readable stream.
-
-A Readable stream will not start emitting data until you indicate that
-you are ready to receive it.
-
-Readable streams have two "modes": a **flowing mode** and a **paused
-mode**. When in flowing mode, data is read from the underlying system
-and provided to your program as fast as possible. In paused mode, you
-must explicitly call [`stream.read()`][stream-read] to get chunks of data out.
-Streams start out in paused mode.
-
-**Note**: If no data event handlers are attached, and there are no
-[`stream.pipe()`][] destinations, and the stream is switched into flowing
-mode, then data will be lost.
-
-You can switch to flowing mode by doing any of the following:
-
-* Adding a [`'data'`][] event handler to listen for data.
-* Calling the [`stream.resume()`][stream-resume] method to explicitly open the
-  flow.
-* Calling the [`stream.pipe()`][] method to send the data to a [Writable][].
-
-You can switch back to paused mode by doing either of the following:
-
-* If there are no pipe destinations, by calling the
-  [`stream.pause()`][stream-pause] method.
-* If there are pipe destinations, by removing any [`'data'`][] event
-  handlers, and removing all pipe destinations by calling the
-  [`stream.unpipe()`][] method.
-
-Note that, for backwards compatibility reasons, removing [`'data'`][]
-event handlers will **not** automatically pause the stream. Also, if
-there are piped destinations, then calling [`stream.pause()`][stream-pause] will
-not guarantee that the stream will *remain* paused once those
-destinations drain and ask for more data.
-
-Examples of readable streams include:
-
-* [HTTP responses, on the client][http-incoming-message]
-* [HTTP requests, on the server][http-incoming-message]
-* [fs read streams][]
-* [zlib streams][zlib]
-* [crypto streams][crypto]
-* [TCP sockets][]
-* [child process stdout and stderr][]
-* [`process.stdin`][]
-
-#### Event: 'close'
-
-Emitted when the stream and any of its underlying resources (a file
-descriptor, for example) have been closed. The event indicates that
-no more events will be emitted, and no further computation will occur.
-
-Not all streams will emit the `'close'` event.
-
-#### Event: 'data'
-
-* `chunk` {Buffer|String} The chunk of data.
-
-Attaching a `'data'` event listener to a stream that has not been
-explicitly paused will switch the stream into flowing mode. Data will
-then be passed as soon as it is available.
-
-If you just want to get all the data out of the stream as fast as
-possible, this is the best way to do so.
-
-```js
-var readable = getReadableStreamSomehow();
-readable.on('data', (chunk) => {
-  console.log('got %d bytes of data', chunk.length);
-});
-```
-
-#### Event: 'end'
-
-This event fires when there will be no more data to read.
-
-Note that the `'end'` event **will not fire** unless the data is
-completely consumed. This can be done by switching into flowing mode,
-or by calling [`stream.read()`][stream-read] repeatedly until you get to the
-end.
-
-```js
-var readable = getReadableStreamSomehow();
-readable.on('data', (chunk) => {
-  console.log('got %d bytes of data', chunk.length);
-});
-readable.on('end', () => {
-  console.log('there will be no more data.');
-});
-```
-
-#### Event: 'error'
-
-* {Error Object}
-
-Emitted if there was an error receiving data.
-
-#### Event: 'readable'
-
-When a chunk of data can be read from the stream, it will emit a
-`'readable'` event.
-
-In some cases, listening for a `'readable'` event will cause some data
-to be read into the internal buffer from the underlying system, if it
-hadn't already.
-
-```javascript
-var readable = getReadableStreamSomehow();
-readable.on('readable', () => {
-  // there is some data to read now
-});
-```
-
-Once the internal buffer is drained, a `'readable'` event will fire
-again when more data is available.
-
-The `'readable'` event is not emitted in the "flowing" mode with the
-sole exception of the last one, on end-of-stream.
-
-The `'readable'` event indicates that the stream has new information:
-either new data is available or the end of the stream has been reached.
-In the former case, [`stream.read()`][stream-read] will return that data. In the
-latter case, [`stream.read()`][stream-read] will return null. For instance, in
-the following example, `foo.txt` is an empty file:
-
-```js
-const fs = require('fs');
-var rr = fs.createReadStream('foo.txt');
-rr.on('readable', () => {
-  console.log('readable:', rr.read());
-});
-rr.on('end', () => {
-  console.log('end');
-});
-```
-
-The output of running this script is:
-
-```
-$ node test.js
-readable: null
-end
-```
-
-#### readable.isPaused()
-
-* Return: {Boolean}
-
-This method returns whether or not the `readable` has been **explicitly**
-paused by client code (using [`stream.pause()`][stream-pause] without a
-corresponding [`stream.resume()`][stream-resume]).
-
-```js
-var readable = new stream.Readable
-
-readable.isPaused() // === false
-readable.pause()
-readable.isPaused() // === true
-readable.resume()
-readable.isPaused() // === false
-```
-
-#### readable.pause()
-
-* Return: `this`
-
-This method will cause a stream in flowing mode to stop emitting
-[`'data'`][] events, switching out of flowing mode. Any data that becomes
-available will remain in the internal buffer.
-
-```js
-var readable = getReadableStreamSomehow();
-readable.on('data', (chunk) => {
-  console.log('got %d bytes of data', chunk.length);
-  readable.pause();
-  console.log('there will be no more data for 1 second');
-  setTimeout(() => {
-    console.log('now data will start flowing again');
-    readable.resume();
-  }, 1000);
-});
-```
-
-#### readable.pipe(destination[, options])
-
-* `destination` {stream.Writable} The destination for writing data
-* `options` {Object} Pipe options
-  * `end` {Boolean} End the writer when the reader ends. Default = `true`
-
-This method pulls all the data out of a readable stream, and writes it
-to the supplied destination, automatically managing the flow so that
-the destination is not overwhelmed by a fast readable stream.
-
-Multiple destinations can be piped to safely.
-
-```js
-var readable = getReadableStreamSomehow();
-var writable = fs.createWriteStream('file.txt');
-// All the data from readable goes into 'file.txt'
-readable.pipe(writable);
-```
-
-This function returns the destination stream, so you can set up pipe
-chains like so:
-
-```js
-var r = fs.createReadStream('file.txt');
-var z = zlib.createGzip();
-var w = fs.createWriteStream('file.txt.gz');
-r.pipe(z).pipe(w);
-```
-
-For example, emulating the Unix `cat` command:
-
-```js
-process.stdin.pipe(process.stdout);
-```
-
-By default [`stream.end()`][stream-end] is called on the destination when the
-source stream emits [`'end'`][], so that `destination` is no longer writable.
-Pass `{ end: false }` as `options` to keep the destination stream open.
-
-This keeps `writer` open so that "Goodbye" can be written at the
-end.
-
-```js
-reader.pipe(writer, { end: false });
-reader.on('end', () => {
-  writer.end('Goodbye\n');
-});
-```
-
-Note that [`process.stderr`][] and [`process.stdout`][] are never closed until
-the process exits, regardless of the specified options.
-
-#### readable.read([size])
-
-* `size` {Number} Optional argument to specify how much data to read.
-* Return {String|Buffer|Null}
-
-The `read()` method pulls some data out of the internal buffer and
-returns it. If there is no data available, then it will return
-`null`.
-
-If you pass in a `size` argument, then it will return that many
-bytes. If `size` bytes are not available, then it will return `null`,
-unless we've ended, in which case it will return the data remaining
-in the buffer.
-
-If you do not specify a `size` argument, then it will return all the
-data in the internal buffer.
-
-This method should only be called in paused mode. In flowing mode,
-this method is called automatically until the internal buffer is
-drained.
-
-```js
-var readable = getReadableStreamSomehow();
-readable.on('readable', () => {
-  var chunk;
-  while (null !== (chunk = readable.read())) {
-    console.log('got %d bytes of data', chunk.length);
-  }
-});
-```
-
-If this method returns a data chunk, then it will also trigger the
-emission of a [`'data'`][] event.
-
-Note that calling [`stream.read([size])`][stream-read] after the [`'end'`][]
-event has been triggered will return `null`. No runtime error will be raised.
-
-#### readable.resume()
-
-* Return: `this`
-
-This method will cause the readable stream to resume emitting [`'data'`][]
-events.
-
-This method will switch the stream into flowing mode. If you do *not*
-want to consume the data from a stream, but you *do* want to get to
-its [`'end'`][] event, you can call [`stream.resume()`][stream-resume] to open
-the flow of data.
-
-```js
-var readable = getReadableStreamSomehow();
-readable.resume();
-readable.on('end', () => {
-  console.log('got to the end, but did not read anything');
-});
-```
-
-#### readable.setEncoding(encoding)
-
-* `encoding` {String} The encoding to use.
-* Return: `this`
-
-Call this function to cause the stream to return strings of the specified
-encoding instead of Buffer objects. For example, if you do
-`readable.setEncoding('utf8')`, then the output data will be interpreted as
-UTF-8 data, and returned as strings. If you do `readable.setEncoding('hex')`,
-then the data will be encoded in hexadecimal string format.
-
-This properly handles multi-byte characters that would otherwise be
-potentially mangled if you simply pulled the Buffers directly and
-called [`buf.toString(encoding)`][] on them. If you want to read the data
-as strings, always use this method.
-
-Also you can disable any encoding at all with `readable.setEncoding(null)`.
-This approach is very useful if you deal with binary data or with large
-multi-byte strings spread out over multiple chunks.
-
-```js
-var readable = getReadableStreamSomehow();
-readable.setEncoding('utf8');
-readable.on('data', (chunk) => {
-  assert.equal(typeof chunk, 'string');
-  console.log('got %d characters of string data', chunk.length);
-});
-```
-
-#### readable.unpipe([destination])
-
-* `destination` {stream.Writable} Optional specific stream to unpipe
-
-This method will remove the hooks set up for a previous [`stream.pipe()`][]
-call.
-
-If the destination is not specified, then all pipes are removed.
-
-If the destination is specified, but no pipe is set up for it, then
-this is a no-op.
-
-```js
-var readable = getReadableStreamSomehow();
-var writable = fs.createWriteStream('file.txt');
-// All the data from readable goes into 'file.txt',
-// but only for the first second
-readable.pipe(writable);
-setTimeout(() => {
-  console.log('stop writing to file.txt');
-  readable.unpipe(writable);
-  console.log('manually close the file stream');
-  writable.end();
-}, 1000);
-```
-
-#### readable.unshift(chunk)
-
-* `chunk` {Buffer|String} Chunk of data to unshift onto the read queue
-
-This is useful in certain cases where a stream is being consumed by a
-parser, which needs to "un-consume" some data that it has
-optimistically pulled out of the source, so that the stream can be
-passed on to some other party.
-
-Note that `stream.unshift(chunk)` cannot be called after the [`'end'`][] event
-has been triggered; a runtime error will be raised.
-
-If you find that you must often call `stream.unshift(chunk)` in your
-programs, consider implementing a [Transform][] stream instead. (See [API
-for Stream Implementors][].)
-
-```js
-// Pull off a header delimited by \n\n
-// use unshift() if we get too much
-// Call the callback with (error, header, stream)
-const StringDecoder = require('string_decoder').StringDecoder;
-function parseHeader(stream, callback) {
-  stream.on('error', callback);
-  stream.on('readable', onReadable);
-  var decoder = new StringDecoder('utf8');
-  var header = '';
-  function onReadable() {
-    var chunk;
-    while (null !== (chunk = stream.read())) {
-      var str = decoder.write(chunk);
-      if (str.match(/\n\n/)) {
-        // found the header boundary
-        var split = str.split(/\n\n/);
-        header += split.shift();
-        var remaining = split.join('\n\n');
-        var buf = new Buffer(remaining, 'utf8');
-        if (buf.length)
-          stream.unshift(buf);
-        stream.removeListener('error', callback);
-        stream.removeListener('readable', onReadable);
-        // now the body of the message can be read from the stream.
-        callback(null, header, stream);
-      } else {
-        // still reading the header.
-        header += str;
-      }
-    }
-  }
-}
-```
-
-Note that, unlike [`stream.push(chunk)`][stream-push], `stream.unshift(chunk)`
-will not end the reading process by resetting the internal reading state of the
-stream. This can cause unexpected results if `unshift()` is called during a
-read (i.e. from within a [`stream._read()`][stream-_read] implementation on a
-custom stream). Following the call to `unshift()` with an immediate
-[`stream.push('')`][stream-push] will reset the reading state appropriately,
-however it is best to simply avoid calling `unshift()` while in the process of
-performing a read.
-
-#### readable.wrap(stream)
-
-* `stream` {Stream} An "old style" readable stream
-
-Versions of Node.js prior to v0.10 had streams that did not implement the
-entire Streams API as it is today. (See [Compatibility][] for
-more information.)
-
-If you are using an older Node.js library that emits [`'data'`][] events and
-has a [`stream.pause()`][stream-pause] method that is advisory only, then you
-can use the `wrap()` method to create a [Readable][] stream that uses the old
-stream as its data source.
-
-You will very rarely ever need to call this function, but it exists
-as a convenience for interacting with old Node.js programs and libraries.
-
-For example:
-
-```js
-const OldReader = require('./old-api-module.js').OldReader;
-const Readable = require('stream').Readable;
-const oreader = new OldReader;
-const myReader = new Readable().wrap(oreader);
-
-myReader.on('readable', () => {
-  myReader.read(); // etc.
-});
-```
-
-### Class: stream.Transform
-
-Transform streams are [Duplex][] streams where the output is in some way
-computed from the input. They implement both the [Readable][] and
-[Writable][] interfaces.
-
-Examples of Transform streams include:
-
-* [zlib streams][zlib]
-* [crypto streams][crypto]
-
-### Class: stream.Writable
-
-<!--type=class-->
-
-The Writable stream interface is an abstraction for a *destination*
-that you are writing data *to*.
-
-Examples of writable streams include:
-
-* [HTTP requests, on the client][]
-* [HTTP responses, on the server][]
-* [fs write streams][]
-* [zlib streams][zlib]
-* [crypto streams][crypto]
-* [TCP sockets][]
-* [child process stdin][]
-* [`process.stdout`][], [`process.stderr`][]
-
-#### Event: 'drain'
-
-If a [`stream.write(chunk)`][stream-write] call returns `false`, then the
-`'drain'` event will indicate when it is appropriate to begin writing more data
-to the stream.
-
-```js
-// Write the data to the supplied writable stream one million times.
-// Be attentive to back-pressure.
-function writeOneMillionTimes(writer, data, encoding, callback) {
-  var i = 1000000;
-  write();
-  function write() {
-    var ok = true;
-    do {
-      i -= 1;
-      if (i === 0) {
-        // last time!
-        writer.write(data, encoding, callback);
-      } else {
-        // see if we should continue, or wait
-        // don't pass the callback, because we're not done yet.
-        ok = writer.write(data, encoding);
-      }
-    } while (i > 0 && ok);
-    if (i > 0) {
-      // had to stop early!
-      // write some more once it drains
-      writer.once('drain', write);
-    }
-  }
-}
-```
-
-#### Event: 'error'
-
-* {Error}
-
-Emitted if there was an error when writing or piping data.
-
-#### Event: 'finish'
-
-When the [`stream.end()`][stream-end] method has been called, and all data has
-been flushed to the underlying system, this event is emitted.
-
-```javascript
-var writer = getWritableStreamSomehow();
-for (var i = 0; i < 100; i ++) {
-  writer.write('hello, #${i}!\n');
-}
-writer.end('this is the end\n');
-writer.on('finish', () => {
-  console.error('all writes are now complete.');
-});
-```
-
-#### Event: 'pipe'
-
-* `src` {stream.Readable} source stream that is piping to this writable
-
-This is emitted whenever the [`stream.pipe()`][] method is called on a readable
-stream, adding this writable to its set of destinations.
-
-```js
-var writer = getWritableStreamSomehow();
-var reader = getReadableStreamSomehow();
-writer.on('pipe', (src) => {
-  console.error('something is piping into the writer');
-  assert.equal(src, reader);
-});
-reader.pipe(writer);
-```
-
-#### Event: 'unpipe'
-
-* `src` {[Readable][] Stream} The source stream that
-  [unpiped][`stream.unpipe()`] this writable
-
-This is emitted whenever the [`stream.unpipe()`][] method is called on a
-readable stream, removing this writable from its set of destinations.
-
-```js
-var writer = getWritableStreamSomehow();
-var reader = getReadableStreamSomehow();
-writer.on('unpipe', (src) => {
-  console.error('something has stopped piping into the writer');
-  assert.equal(src, reader);
-});
-reader.pipe(writer);
-reader.unpipe(writer);
-```
-
-#### writable.cork()
-
-Forces buffering of all writes.
-
-Buffered data will be flushed either at [`stream.uncork()`][] or at
-[`stream.end()`][stream-end] call.
-
-#### writable.end([chunk][, encoding][, callback])
-
-* `chunk` {String|Buffer} Optional data to write
-* `encoding` {String} The encoding, if `chunk` is a String
-* `callback` {Function} Optional callback for when the stream is finished
-
-Call this method when no more data will be written to the stream. If supplied,
-the callback is attached as a listener on the [`'finish'`][] event.
-
-Calling [`stream.write()`][stream-write] after calling
-[`stream.end()`][stream-end] will raise an error.
-
-```js
-// write 'hello, ' and then end with 'world!'
-var file = fs.createWriteStream('example.txt');
-file.write('hello, ');
-file.end('world!');
-// writing more now is not allowed!
-```
-
-#### writable.setDefaultEncoding(encoding)
-
-* `encoding` {String} The new default encoding
-
-Sets the default encoding for a writable stream.
-
-#### writable.uncork()
-
-Flush all data, buffered since [`stream.cork()`][] call.
-
-#### writable.write(chunk[, encoding][, callback])
-
-* `chunk` {String|Buffer} The data to write
-* `encoding` {String} The encoding, if `chunk` is a String
-* `callback` {Function} Callback for when this chunk of data is flushed
-* Returns: {Boolean} `true` if the data was handled completely.
-
-This method writes some data to the underlying system, and calls the
-supplied callback once the data has been fully handled.
-
-The return value indicates if you should continue writing right now.
-If the data had to be buffered internally, then it will return
-`false`. Otherwise, it will return `true`.
-
-This return value is strictly advisory. You MAY continue to write,
-even if it returns `false`. However, writes will be buffered in
-memory, so it is best not to do this excessively. Instead, wait for
-the [`'drain'`][] event before writing more data.
-
-
-## API for Stream Implementors
-
-<!--type=misc-->
-
-To implement any sort of stream, the pattern is the same:
-
-1. Extend the appropriate parent class in your own subclass. (The
-   [`util.inherits()`][] method is particularly helpful for this.)
-2. Call the appropriate parent class constructor in your constructor,
-   to be sure that the internal mechanisms are set up properly.
-3. Implement one or more specific methods, as detailed below.
-
-The class to extend and the method(s) to implement depend on the sort
-of stream class you are writing:
-
-<table>
-  <thead>
-    <tr>
-      <th>
-        <p>Use-case</p>
-      </th>
-      <th>
-        <p>Class</p>
-      </th>
-      <th>
-        <p>Method(s) to implement</p>
-      </th>
-    </tr>
-  </thead>
-  <tr>
-    <td>
-      <p>Reading only</p>
-    </td>
-    <td>
-      <p>[Readable](#stream_class_stream_readable_1)</p>
-    </td>
-    <td>
-      <p><code>[_read][stream-_read]</code></p>
-    </td>
-  </tr>
-  <tr>
-    <td>
-      <p>Writing only</p>
-    </td>
-    <td>
-      <p>[Writable](#stream_class_stream_writable_1)</p>
-    </td>
-    <td>
-      <p><code>[_write][stream-_write]</code>, <code>[_writev][stream-_writev]</code></p>
-    </td>
-  </tr>
-  <tr>
-    <td>
-      <p>Reading and writing</p>
-    </td>
-    <td>
-      <p>[Duplex](#stream_class_stream_duplex_1)</p>
-    </td>
-    <td>
-      <p><code>[_read][stream-_read]</code>, <code>[_write][stream-_write]</code>, <code>[_writev][stream-_writev]</code></p>
-    </td>
-  </tr>
-  <tr>
-    <td>
-      <p>Operate on written data, then read the result</p>
-    </td>
-    <td>
-      <p>[Transform](#stream_class_stream_transform_1)</p>
-    </td>
-    <td>
-      <p><code>[_transform][stream-_transform]</code>, <code>[_flush][stream-_flush]</code></p>
-    </td>
-  </tr>
-</table>
-
-In your implementation code, it is very important to never call the methods
-described in [API for Stream Consumers][]. Otherwise, you can potentially cause
-adverse side effects in programs that consume your streaming interfaces.
-
-### Class: stream.Duplex
-
-<!--type=class-->
-
-A "duplex" stream is one that is both Readable and Writable, such as a TCP
-socket connection.
-
-Note that `stream.Duplex` is an abstract class designed to be extended
-with an underlying implementation of the [`stream._read(size)`][stream-_read]
-and [`stream._write(chunk, encoding, callback)`][stream-_write] methods as you
-would with a Readable or Writable stream class.
-
-Since JavaScript doesn't have multiple prototypal inheritance, this class
-prototypally inherits from Readable, and then parasitically from Writable. It is
-thus up to the user to implement both the low-level
-[`stream._read(n)`][stream-_read] method as well as the low-level
-[`stream._write(chunk, encoding, callback)`][stream-_write] method on extension
-duplex classes.
-
-#### new stream.Duplex(options)
-
-* `options` {Object} Passed to both Writable and Readable
-  constructors. Also has the following fields:
-  * `allowHalfOpen` {Boolean} Default = `true`. If set to `false`, then
-    the stream will automatically end the readable side when the
-    writable side ends and vice versa.
-  * `readableObjectMode` {Boolean} Default = `false`. Sets `objectMode`
-    for readable side of the stream. Has no effect if `objectMode`
-    is `true`.
-  * `writableObjectMode` {Boolean} Default = `false`. Sets `objectMode`
-    for writable side of the stream. Has no effect if `objectMode`
-    is `true`.
-
-In classes that extend the Duplex class, make sure to call the
-constructor so that the buffering settings can be properly
-initialized.
-
-### Class: stream.PassThrough
-
-This is a trivial implementation of a [Transform][] stream that simply
-passes the input bytes across to the output. Its purpose is mainly
-for examples and testing, but there are occasionally use cases where
-it can come in handy as a building block for novel sorts of streams.
-
-### Class: stream.Readable
-
-<!--type=class-->
-
-`stream.Readable` is an abstract class designed to be extended with an
-underlying implementation of the [`stream._read(size)`][stream-_read] method.
-
-Please see [API for Stream Consumers][] for how to consume
-streams in your programs. What follows is an explanation of how to
-implement Readable streams in your programs.
-
-#### new stream.Readable([options])
-
-* `options` {Object}
-  * `highWaterMark` {Number} The maximum number of bytes to store in
-    the internal buffer before ceasing to read from the underlying
-    resource. Default = `16384` (16kb), or `16` for `objectMode` streams
-  * `encoding` {String} If specified, then buffers will be decoded to
-    strings using the specified encoding. Default = `null`
-  * `objectMode` {Boolean} Whether this stream should behave
-    as a stream of objects. Meaning that [`stream.read(n)`][stream-read] returns
-    a single value instead of a Buffer of size n. Default = `false`
-  * `read` {Function} Implementation for the [`stream._read()`][stream-_read]
-    method.
-
-In classes that extend the Readable class, make sure to call the
-Readable constructor so that the buffering settings can be properly
-initialized.
-
-#### readable.\_read(size)
-
-* `size` {Number} Number of bytes to read asynchronously
-
-Note: **Implement this method, but do NOT call it directly.**
-
-This method is prefixed with an underscore because it is internal to the
-class that defines it and should only be called by the internal Readable
-class methods. All Readable stream implementations must provide a \_read
-method to fetch data from the underlying resource.
-
-When `_read()` is called, if data is available from the resource, the `_read()`
-implementation should start pushing that data into the read queue by calling
-[`this.push(dataChunk)`][stream-push]. `_read()` should continue reading from
-the resource and pushing data until push returns `false`, at which point it
-should stop reading from the resource. Only when `_read()` is called again after
-it has stopped should it start reading more data from the resource and pushing
-that data onto the queue.
-
-Note: once the `_read()` method is called, it will not be called again until
-the [`stream.push()`][stream-push] method is called.
-
-The `size` argument is advisory. Implementations where a "read" is a
-single call that returns data can use this to know how much data to
-fetch. Implementations where that is not relevant, such as TCP or
-TLS, may ignore this argument, and simply provide data whenever it
-becomes available. There is no need, for example to "wait" until
-`size` bytes are available before calling [`stream.push(chunk)`][stream-push].
-
-#### readable.push(chunk[, encoding])
-
-
-* `chunk` {Buffer|Null|String} Chunk of data to push into the read queue
-* `encoding` {String} Encoding of String chunks.  Must be a valid
-  Buffer encoding, such as `'utf8'` or `'ascii'`
-* return {Boolean} Whether or not more pushes should be performed
-
-Note: **This method should be called by Readable implementors, NOT
-by consumers of Readable streams.**
-
-If a value other than null is passed, The `push()` method adds a chunk of data
-into the queue for subsequent stream processors to consume. If `null` is
-passed, it signals the end of the stream (EOF), after which no more data
-can be written.
-
-The data added with `push()` can be pulled out by calling the
-[`stream.read()`][stream-read] method when the [`'readable'`][] event fires.
-
-This API is designed to be as flexible as possible. For example,
-you may be wrapping a lower-level source which has some sort of
-pause/resume mechanism, and a data callback. In those cases, you
-could wrap the low-level source object by doing something like this:
-
-```js
-// source is an object with readStop() and readStart() methods,
-// and an `ondata` member that gets called when it has data, and
-// an `onend` member that gets called when the data is over.
-
-util.inherits(SourceWrapper, Readable);
-
-function SourceWrapper(options) {
-  Readable.call(this, options);
-
-  this._source = getLowlevelSourceObject();
-
-  // Every time there's data, we push it into the internal buffer.
-  this._source.ondata = (chunk) => {
-    // if push() returns false, then we need to stop reading from source
-    if (!this.push(chunk))
-      this._source.readStop();
-  };
-
-  // When the source ends, we push the EOF-signaling `null` chunk
-  this._source.onend = () => {
-    this.push(null);
-  };
-}
-
-// _read will be called when the stream wants to pull more data in
-// the advisory size argument is ignored in this case.
-SourceWrapper.prototype._read = function(size) {
-  this._source.readStart();
-};
-```
-
-#### Example: A Counting Stream
-
-<!--type=example-->
-
-This is a basic example of a Readable stream. It emits the numerals
-from 1 to 1,000,000 in ascending order, and then ends.
-
-```js
-const Readable = require('stream').Readable;
-const util = require('util');
-util.inherits(Counter, Readable);
-
-function Counter(opt) {
-  Readable.call(this, opt);
-  this._max = 1000000;
-  this._index = 1;
-}
-
-Counter.prototype._read = function() {
-  var i = this._index++;
-  if (i > this._max)
-    this.push(null);
-  else {
-    var str = '' + i;
-    var buf = new Buffer(str, 'ascii');
-    this.push(buf);
-  }
-};
-```
-
-#### Example: SimpleProtocol v1 (Sub-optimal)
-
-This is similar to the `parseHeader` function described
-[here](#stream_readable_unshift_chunk), but implemented as a custom stream.
-Also, note that this implementation does not convert the incoming data to a
-string.
-
-However, this would be better implemented as a [Transform][] stream. See
-[SimpleProtocol v2][] for a better implementation.
-
-```js
-// A parser for a simple data protocol.
-// The "header" is a JSON object, followed by 2 \n characters, and
-// then a message body.
-//
-// NOTE: This can be done more simply as a Transform stream!
-// Using Readable directly for this is sub-optimal. See the
-// alternative example below under the Transform section.
-
-const Readable = require('stream').Readable;
-const util = require('util');
-
-util.inherits(SimpleProtocol, Readable);
-
-function SimpleProtocol(source, options) {
-  if (!(this instanceof SimpleProtocol))
-    return new SimpleProtocol(source, options);
-
-  Readable.call(this, options);
-  this._inBody = false;
-  this._sawFirstCr = false;
-
-  // source is a readable stream, such as a socket or file
-  this._source = source;
-
-  var self = this;
-  source.on('end', () => {
-    self.push(null);
-  });
-
-  // give it a kick whenever the source is readable
-  // read(0) will not consume any bytes
-  source.on('readable', () => {
-    self.read(0);
-  });
-
-  this._rawHeader = [];
-  this.header = null;
-}
-
-SimpleProtocol.prototype._read = function(n) {
-  if (!this._inBody) {
-    var chunk = this._source.read();
-
-    // if the source doesn't have data, we don't have data yet.
-    if (chunk === null)
-      return this.push('');
-
-    // check if the chunk has a \n\n
-    var split = -1;
-    for (var i = 0; i < chunk.length; i++) {
-      if (chunk[i] === 10) { // '\n'
-        if (this._sawFirstCr) {
-          split = i;
-          break;
-        } else {
-          this._sawFirstCr = true;
-        }
-      } else {
-        this._sawFirstCr = false;
-      }
-    }
-
-    if (split === -1) {
-      // still waiting for the \n\n
-      // stash the chunk, and try again.
-      this._rawHeader.push(chunk);
-      this.push('');
-    } else {
-      this._inBody = true;
-      var h = chunk.slice(0, split);
-      this._rawHeader.push(h);
-      var header = Buffer.concat(this._rawHeader).toString();
-      try {
-        this.header = JSON.parse(header);
-      } catch (er) {
-        this.emit('error', new Error('invalid simple protocol data'));
-        return;
-      }
-      // now, because we got some extra data, unshift the rest
-      // back into the read queue so that our consumer will see it.
-      var b = chunk.slice(split);
-      this.unshift(b);
-      // calling unshift by itself does not reset the reading state
-      // of the stream; since we're inside _read, doing an additional
-      // push('') will reset the state appropriately.
-      this.push('');
-
-      // and let them know that we are done parsing the header.
-      this.emit('header', this.header);
-    }
-  } else {
-    // from there on, just provide the data to our consumer.
-    // careful not to push(null), since that would indicate EOF.
-    var chunk = this._source.read();
-    if (chunk) this.push(chunk);
-  }
-};
-
-// Usage:
-// var parser = new SimpleProtocol(source);
-// Now parser is a readable stream that will emit 'header'
-// with the parsed header data.
-```
-
-### Class: stream.Transform
-
-A "transform" stream is a duplex stream where the output is causally
-connected in some way to the input, such as a [zlib][] stream or a
-[crypto][] stream.
-
-There is no requirement that the output be the same size as the input,
-the same number of chunks, or arrive at the same time. For example, a
-Hash stream will only ever have a single chunk of output which is
-provided when the input is ended. A zlib stream will produce output
-that is either much smaller or much larger than its input.
-
-Rather than implement the [`stream._read()`][stream-_read] and
-[`stream._write()`][stream-_write] methods, Transform classes must implement the
-[`stream._transform()`][stream-_transform] method, and may optionally
-also implement the [`stream._flush()`][stream-_flush] method. (See below.)
-
-#### new stream.Transform([options])
-
-* `options` {Object} Passed to both Writable and Readable
-  constructors. Also has the following fields:
-  * `transform` {Function} Implementation for the
-    [`stream._transform()`][stream-_transform] method.
-  * `flush` {Function} Implementation for the [`stream._flush()`][stream-_flush]
-    method.
-
-In classes that extend the Transform class, make sure to call the
-constructor so that the buffering settings can be properly
-initialized.
-
-#### Events: 'finish' and 'end'
-
-The [`'finish'`][] and [`'end'`][] events are from the parent Writable
-and Readable classes respectively. The `'finish'` event is fired after
-[`stream.end()`][stream-end] is called and all chunks have been processed by
-[`stream._transform()`][stream-_transform], `'end'` is fired after all data has
-been output which is after the callback in [`stream._flush()`][stream-_flush]
-has been called.
-
-#### transform.\_flush(callback)
-
-* `callback` {Function} Call this function (optionally with an error
-  argument) when you are done flushing any remaining data.
-
-Note: **This function MUST NOT be called directly.**  It MAY be implemented
-by child classes, and if so, will be called by the internal Transform
-class methods only.
-
-In some cases, your transform operation may need to emit a bit more
-data at the end of the stream. For example, a `Zlib` compression
-stream will store up some internal state so that it can optimally
-compress the output. At the end, however, it needs to do the best it
-can with what is left, so that the data will be complete.
-
-In those cases, you can implement a `_flush()` method, which will be
-called at the very end, after all the written data is consumed, but
-before emitting [`'end'`][] to signal the end of the readable side. Just
-like with [`stream._transform()`][stream-_transform], call
-`transform.push(chunk)` zero or more times, as appropriate, and call `callback`
-when the flush operation is complete.
-
-This method is prefixed with an underscore because it is internal to
-the class that defines it, and should not be called directly by user
-programs. However, you **are** expected to override this method in
-your own extension classes.
-
-#### transform.\_transform(chunk, encoding, callback)
-
-* `chunk` {Buffer|String} The chunk to be transformed. Will **always**
-  be a buffer unless the `decodeStrings` option was set to `false`.
-* `encoding` {String} If the chunk is a string, then this is the
-  encoding type. If chunk is a buffer, then this is the special
-  value - 'buffer', ignore it in this case.
-* `callback` {Function} Call this function (optionally with an error
-  argument and data) when you are done processing the supplied chunk.
-
-Note: **This function MUST NOT be called directly.**  It should be
-implemented by child classes, and called by the internal Transform
-class methods only.
-
-All Transform stream implementations must provide a `_transform()`
-method to accept input and produce output.
-
-`_transform()` should do whatever has to be done in this specific
-Transform class, to handle the bytes being written, and pass them off
-to the readable portion of the interface. Do asynchronous I/O,
-process things, and so on.
-
-Call `transform.push(outputChunk)` 0 or more times to generate output
-from this input chunk, depending on how much data you want to output
-as a result of this chunk.
-
-Call the callback function only when the current chunk is completely
-consumed. Note that there may or may not be output as a result of any
-particular input chunk. If you supply a second argument to the callback
-it will be passed to the push method. In other words the following are
-equivalent:
-
-```js
-transform.prototype._transform = function (data, encoding, callback) {
-  this.push(data);
-  callback();
-};
-
-transform.prototype._transform = function (data, encoding, callback) {
-  callback(null, data);
-};
-```
-
-This method is prefixed with an underscore because it is internal to
-the class that defines it, and should not be called directly by user
-programs. However, you **are** expected to override this method in
-your own extension classes.
-
-#### Example: `SimpleProtocol` parser v2
-
-The example [here](#stream_example_simpleprotocol_v1_sub_optimal) of a simple
-protocol parser can be implemented simply by using the higher level
-[Transform][] stream class, similar to the `parseHeader` and `SimpleProtocol
-v1` examples.
-
-In this example, rather than providing the input as an argument, it
-would be piped into the parser, which is a more idiomatic Node.js stream
-approach.
-
-```javascript
-const util = require('util');
-const Transform = require('stream').Transform;
-util.inherits(SimpleProtocol, Transform);
-
-function SimpleProtocol(options) {
-  if (!(this instanceof SimpleProtocol))
-    return new SimpleProtocol(options);
-
-  Transform.call(this, options);
-  this._inBody = false;
-  this._sawFirstCr = false;
-  this._rawHeader = [];
-  this.header = null;
-}
-
-SimpleProtocol.prototype._transform = function(chunk, encoding, done) {
-  if (!this._inBody) {
-    // check if the chunk has a \n\n
-    var split = -1;
-    for (var i = 0; i < chunk.length; i++) {
-      if (chunk[i] === 10) { // '\n'
-        if (this._sawFirstCr) {
-          split = i;
-          break;
-        } else {
-          this._sawFirstCr = true;
-        }
-      } else {
-        this._sawFirstCr = false;
-      }
-    }
-
-    if (split === -1) {
-      // still waiting for the \n\n
-      // stash the chunk, and try again.
-      this._rawHeader.push(chunk);
-    } else {
-      this._inBody = true;
-      var h = chunk.slice(0, split);
-      this._rawHeader.push(h);
-      var header = Buffer.concat(this._rawHeader).toString();
-      try {
-        this.header = JSON.parse(header);
-      } catch (er) {
-        this.emit('error', new Error('invalid simple protocol data'));
-        return;
-      }
-      // and let them know that we are done parsing the header.
-      this.emit('header', this.header);
-
-      // now, because we got some extra data, emit this first.
-      this.push(chunk.slice(split));
-    }
-  } else {
-    // from there on, just provide the data to our consumer as-is.
-    this.push(chunk);
-  }
-  done();
-};
-
-// Usage:
-// var parser = new SimpleProtocol();
-// source.pipe(parser)
-// Now parser is a readable stream that will emit 'header'
-// with the parsed header data.
-```
-
-### Class: stream.Writable
-
-<!--type=class-->
-
-`stream.Writable` is an abstract class designed to be extended with an
-underlying implementation of the
-[`stream._write(chunk, encoding, callback)`][stream-_write] method.
-
-Please see [API for Stream Consumers][] for how to consume
-writable streams in your programs. What follows is an explanation of
-how to implement Writable streams in your programs.
-
-#### new stream.Writable([options])
-
-* `options` {Object}
-  * `highWaterMark` {Number} Buffer level when
-    [`stream.write()`][stream-write] starts returning `false`. Default = `16384`
-    (16kb), or `16` for `objectMode` streams.
-  * `decodeStrings` {Boolean} Whether or not to decode strings into
-    Buffers before passing them to [`stream._write()`][stream-_write].
-    Default = `true`
-  * `objectMode` {Boolean} Whether or not the
-    [`stream.write(anyObj)`][stream-write] is a valid operation. If set you can
-    write arbitrary data instead of only `Buffer` / `String` data.
-    Default = `false`
-  * `write` {Function} Implementation for the
-    [`stream._write()`][stream-_write] method.
-  * `writev` {Function} Implementation for the
-    [`stream._writev()`][stream-_writev] method.
-
-In classes that extend the Writable class, make sure to call the
-constructor so that the buffering settings can be properly
-initialized.
-
-#### writable.\_write(chunk, encoding, callback)
-
-* `chunk` {Buffer|String} The chunk to be written. Will **always**
-  be a buffer unless the `decodeStrings` option was set to `false`.
-* `encoding` {String} If the chunk is a string, then this is the
-  encoding type. If chunk is a buffer, then this is the special
-  value - 'buffer', ignore it in this case.
-* `callback` {Function} Call this function (optionally with an error
-  argument) when you are done processing the supplied chunk.
-
-All Writable stream implementations must provide a
-[`stream._write()`][stream-_write] method to send data to the underlying
-resource.
-
-Note: **This function MUST NOT be called directly.**  It should be
-implemented by child classes, and called by the internal Writable
-class methods only.
-
-Call the callback using the standard `callback(error)` pattern to
-signal that the write completed successfully or with an error.
-
-If the `decodeStrings` flag is set in the constructor options, then
-`chunk` may be a string rather than a Buffer, and `encoding` will
-indicate the sort of string that it is. This is to support
-implementations that have an optimized handling for certain string
-data encodings. If you do not explicitly set the `decodeStrings`
-option to `false`, then you can safely ignore the `encoding` argument,
-and assume that `chunk` will always be a Buffer.
-
-This method is prefixed with an underscore because it is internal to
-the class that defines it, and should not be called directly by user
-programs. However, you **are** expected to override this method in
-your own extension classes.
-
-#### writable.\_writev(chunks, callback)
-
-* `chunks` {Array} The chunks to be written. Each chunk has following
-  format: `{ chunk: ..., encoding: ... }`.
-* `callback` {Function} Call this function (optionally with an error
-  argument) when you are done processing the supplied chunks.
-
-Note: **This function MUST NOT be called directly.**  It may be
-implemented by child classes, and called by the internal Writable
-class methods only.
-
-This function is completely optional to implement. In most cases it is
-unnecessary. If implemented, it will be called with all the chunks
-that are buffered in the write queue.
-
-
-## Simplified Constructor API
-
-<!--type=misc-->
-
-In simple cases there is now the added benefit of being able to construct a
-stream without inheritance.
-
-This can be done by passing the appropriate methods as constructor options:
-
-Examples:
-
-### Duplex
-
-```js
-var duplex = new stream.Duplex({
-  read: function(n) {
-    // sets this._read under the hood
-
-    // push data onto the read queue, passing null
-    // will signal the end of the stream (EOF)
-    this.push(chunk);
-  },
-  write: function(chunk, encoding, next) {
-    // sets this._write under the hood
-
-    // An optional error can be passed as the first argument
-    next()
-  }
-});
-
-// or
-
-var duplex = new stream.Duplex({
-  read: function(n) {
-    // sets this._read under the hood
-
-    // push data onto the read queue, passing null
-    // will signal the end of the stream (EOF)
-    this.push(chunk);
-  },
-  writev: function(chunks, next) {
-    // sets this._writev under the hood
-
-    // An optional error can be passed as the first argument
-    next()
-  }
-});
-```
-
-### Readable
-
-```js
-var readable = new stream.Readable({
-  read: function(n) {
-    // sets this._read under the hood
-
-    // push data onto the read queue, passing null
-    // will signal the end of the stream (EOF)
-    this.push(chunk);
-  }
-});
-```
-
-### Transform
-
-```js
-var transform = new stream.Transform({
-  transform: function(chunk, encoding, next) {
-    // sets this._transform under the hood
-
-    // generate output as many times as needed
-    // this.push(chunk);
-
-    // call when the current chunk is consumed
-    next();
-  },
-  flush: function(done) {
-    // sets this._flush under the hood
-
-    // generate output as many times as needed
-    // this.push(chunk);
-
-    done();
-  }
-});
-```
-
-### Writable
-
-```js
-var writable = new stream.Writable({
-  write: function(chunk, encoding, next) {
-    // sets this._write under the hood
-
-    // An optional error can be passed as the first argument
-    next()
-  }
-});
-
-// or
-
-var writable = new stream.Writable({
-  writev: function(chunks, next) {
-    // sets this._writev under the hood
-
-    // An optional error can be passed as the first argument
-    next()
-  }
-});
-```
-
-## Streams: Under the Hood
-
-<!--type=misc-->
-
-### Buffering
-
-<!--type=misc-->
-
-Both Writable and Readable streams will buffer data on an internal
-object which can be retrieved from `_writableState.getBuffer()` or
-`_readableState.buffer`, respectively.
-
-The amount of data that will potentially be buffered depends on the
-`highWaterMark` option which is passed into the constructor.
-
-Buffering in Readable streams happens when the implementation calls
-[`stream.push(chunk)`][stream-push]. If the consumer of the Stream does not
-call [`stream.read()`][stream-read], then the data will sit in the internal
-queue until it is consumed.
-
-Buffering in Writable streams happens when the user calls
-[`stream.write(chunk)`][stream-write] repeatedly, even when it returns `false`.
-
-The purpose of streams, especially with the [`stream.pipe()`][] method, is to
-limit the buffering of data to acceptable levels, so that sources and
-destinations of varying speed will not overwhelm the available memory.
-
-### Compatibility with Older Node.js Versions
-
-<!--type=misc-->
-
-In versions of Node.js prior to v0.10, the Readable stream interface was
-simpler, but also less powerful and less useful.
-
-* Rather than waiting for you to call the [`stream.read()`][stream-read] method,
-  [`'data'`][] events would start emitting immediately. If you needed to do
-  some I/O to decide how to handle data, then you had to store the chunks
-  in some kind of buffer so that they would not be lost.
-* The [`stream.pause()`][stream-pause] method was advisory, rather than
-  guaranteed. This meant that you still had to be prepared to receive
-  [`'data'`][] events even when the stream was in a paused state.
-
-In Node.js v0.10, the [Readable][] class was added.
-For backwards compatibility with older Node.js programs, Readable streams
-switch into "flowing mode" when a [`'data'`][] event handler is added, or
-when the [`stream.resume()`][stream-resume] method is called. The effect is
-that, even if you are not using the new [`stream.read()`][stream-read] method
-and [`'readable'`][] event, you no longer have to worry about losing
-[`'data'`][] chunks.
-
-Most programs will continue to function normally. However, this
-introduces an edge case in the following conditions:
-
-* No [`'data'`][] event handler is added.
-* The [`stream.resume()`][stream-resume] method is never called.
-* The stream is not piped to any writable destination.
-
-For example, consider the following code:
-
-```js
-// WARNING!  BROKEN!
-net.createServer((socket) => {
-
-  // we add an 'end' method, but never consume the data
-  socket.on('end', () => {
-    // It will never get here.
-    socket.end('I got your message (but didnt read it)\n');
-  });
-
-}).listen(1337);
-```
-
-In versions of Node.js prior to v0.10, the incoming message data would be
-simply discarded. However, in Node.js v0.10 and beyond,
-the socket will remain paused forever.
-
-The workaround in this situation is to call the
-[`stream.resume()`][stream-resume] method to start the flow of data:
-
-```js
-// Workaround
-net.createServer((socket) => {
-
-  socket.on('end', () => {
-    socket.end('I got your message (but didnt read it)\n');
-  });
-
-  // start the flow of data, discarding it.
-  socket.resume();
-
-}).listen(1337);
-```
-
-In addition to new Readable streams switching into flowing mode,
-pre-v0.10 style streams can be wrapped in a Readable class using the
-[`stream.wrap()`][] method.
-
-
-### Object Mode
-
-<!--type=misc-->
-
-Normally, Streams operate on Strings and Buffers exclusively.
-
-Streams that are in **object mode** can emit generic JavaScript values
-other than Buffers and Strings.
-
-A Readable stream in object mode will always return a single item from
-a call to [`stream.read(size)`][stream-read], regardless of what the size
-argument is.
-
-A Writable stream in object mode will always ignore the `encoding`
-argument to [`stream.write(data, encoding)`][stream-write].
-
-The special value `null` still retains its special value for object
-mode streams. That is, for object mode readable streams, `null` as a
-return value from [`stream.read()`][stream-read] indicates that there is no more
-data, and [`stream.push(null)`][stream-push] will signal the end of stream data
-(`EOF`).
-
-No streams in Node.js core are object mode streams. This pattern is only
-used by userland streaming libraries.
-
-You should set `objectMode` in your stream child class constructor on
-the options object. Setting `objectMode` mid-stream is not safe.
-
-For Duplex streams `objectMode` can be set exclusively for readable or
-writable side with `readableObjectMode` and `writableObjectMode`
-respectively. These options can be used to implement parsers and
-serializers with Transform streams.
-
-```js
-const util = require('util');
-const StringDecoder = require('string_decoder').StringDecoder;
-const Transform = require('stream').Transform;
-util.inherits(JSONParseStream, Transform);
-
-// Gets \n-delimited JSON string data, and emits the parsed objects
-function JSONParseStream() {
-  if (!(this instanceof JSONParseStream))
-    return new JSONParseStream();
-
-  Transform.call(this, { readableObjectMode : true });
-
-  this._buffer = '';
-  this._decoder = new StringDecoder('utf8');
-}
-
-JSONParseStream.prototype._transform = function(chunk, encoding, cb) {
-  this._buffer += this._decoder.write(chunk);
-  // split on newlines
-  var lines = this._buffer.split(/\r?\n/);
-  // keep the last partial line buffered
-  this._buffer = lines.pop();
-  for (var l = 0; l < lines.length; l++) {
-    var line = lines[l];
-    try {
-      var obj = JSON.parse(line);
-    } catch (er) {
-      this.emit('error', er);
-      return;
-    }
-    // push the parsed object out to the readable consumer
-    this.push(obj);
-  }
-  cb();
-};
-
-JSONParseStream.prototype._flush = function(cb) {
-  // Just handle any leftover
-  var rem = this._buffer.trim();
-  if (rem) {
-    try {
-      var obj = JSON.parse(rem);
-    } catch (er) {
-      this.emit('error', er);
-      return;
-    }
-    // push the parsed object out to the readable consumer
-    this.push(obj);
-  }
-  cb();
-};
-```
-
-### `stream.read(0)`
-
-There are some cases where you want to trigger a refresh of the
-underlying readable stream mechanisms, without actually consuming any
-data. In that case, you can call `stream.read(0)`, which will always
-return null.
-
-If the internal read buffer is below the `highWaterMark`, and the
-stream is not currently reading, then calling `stream.read(0)` will trigger
-a low-level [`stream._read()`][stream-_read] call.
-
-There is almost never a need to do this. However, you will see some
-cases in Node.js's internals where this is done, particularly in the
-Readable stream class internals.
-
-### `stream.push('')`
-
-Pushing a zero-byte string or Buffer (when not in [Object mode][]) has an
-interesting side effect. Because it *is* a call to
-[`stream.push()`][stream-push], it will end the `reading` process. However, it
-does *not* add any data to the readable buffer, so there's nothing for
-a user to consume.
-
-Very rarely, there are cases where you have no data to provide now,
-but the consumer of your stream (or, perhaps, another bit of your own
-code) will know when to check again, by calling [`stream.read(0)`][stream-read].
-In those cases, you *may* call `stream.push('')`.
-
-So far, the only use case for this functionality is in the
-[`tls.CryptoStream`][] class, which is deprecated in Node.js/io.js v1.0. If you
-find that you have to use `stream.push('')`, please consider another
-approach, because it almost certainly indicates that something is
-horribly wrong.
-
-[`'data'`]: #stream_event_data
-[`'drain'`]: #stream_event_drain
-[`'end'`]: #stream_event_end
-[`'finish'`]: #stream_event_finish
-[`'readable'`]: #stream_event_readable
-[`buf.toString(encoding)`]: https://nodejs.org/docs/v5.8.0/api/buffer.html#buffer_buf_tostring_encoding_start_end
-[`EventEmitter`]: https://nodejs.org/docs/v5.8.0/api/events.html#events_class_eventemitter
-[`process.stderr`]: https://nodejs.org/docs/v5.8.0/api/process.html#process_process_stderr
-[`process.stdin`]: https://nodejs.org/docs/v5.8.0/api/process.html#process_process_stdin
-[`process.stdout`]: https://nodejs.org/docs/v5.8.0/api/process.html#process_process_stdout
-[`stream.cork()`]: #stream_writable_cork
-[`stream.pipe()`]: #stream_readable_pipe_destination_options
-[`stream.uncork()`]: #stream_writable_uncork
-[`stream.unpipe()`]: #stream_readable_unpipe_destination
-[`stream.wrap()`]: #stream_readable_wrap_stream
-[`tls.CryptoStream`]: https://nodejs.org/docs/v5.8.0/api/tls.html#tls_class_cryptostream
-[`util.inherits()`]: https://nodejs.org/docs/v5.8.0/api/util.html#util_util_inherits_constructor_superconstructor
-[API for Stream Consumers]: #stream_api_for_stream_consumers
-[API for Stream Implementors]: #stream_api_for_stream_implementors
-[child process stdin]: https://nodejs.org/docs/v5.8.0/api/child_process.html#child_process_child_stdin
-[child process stdout and stderr]: https://nodejs.org/docs/v5.8.0/api/child_process.html#child_process_child_stdout
-[Compatibility]: #stream_compatibility_with_older_node_js_versions
-[crypto]: crypto.html
-[Duplex]: #stream_class_stream_duplex
-[fs read streams]: https://nodejs.org/docs/v5.8.0/api/fs.html#fs_class_fs_readstream
-[fs write streams]: https://nodejs.org/docs/v5.8.0/api/fs.html#fs_class_fs_writestream
-[HTTP requests, on the client]: https://nodejs.org/docs/v5.8.0/api/http.html#http_class_http_clientrequest
-[HTTP responses, on the server]: https://nodejs.org/docs/v5.8.0/api/http.html#http_class_http_serverresponse
-[http-incoming-message]: https://nodejs.org/docs/v5.8.0/api/http.html#http_class_http_incomingmessage
-[Object mode]: #stream_object_mode
-[Readable]: #stream_class_stream_readable
-[SimpleProtocol v2]: #stream_example_simpleprotocol_parser_v2
-[stream-_flush]: #stream_transform_flush_callback
-[stream-_read]: #stream_readable_read_size_1
-[stream-_transform]: #stream_transform_transform_chunk_encoding_callback
-[stream-_write]: #stream_writable_write_chunk_encoding_callback_1
-[stream-_writev]: #stream_writable_writev_chunks_callback
-[stream-end]: #stream_writable_end_chunk_encoding_callback
-[stream-pause]: #stream_readable_pause
-[stream-push]: #stream_readable_push_chunk_encoding
-[stream-read]: #stream_readable_read_size
-[stream-resume]: #stream_readable_resume
-[stream-write]: #stream_writable_write_chunk_encoding_callback
-[TCP sockets]: https://nodejs.org/docs/v5.8.0/api/net.html#net_class_net_socket
-[Transform]: #stream_class_stream_transform
-[Writable]: #stream_class_stream_writable
-[zlib]: zlib.html
diff --git a/node_modules/bl/node_modules/readable-stream/doc/wg-meetings/2015-01-30.md b/node_modules/bl/node_modules/readable-stream/doc/wg-meetings/2015-01-30.md
deleted file mode 100644
index 83275f192..000000000
--- a/node_modules/bl/node_modules/readable-stream/doc/wg-meetings/2015-01-30.md
+++ /dev/null
@@ -1,60 +0,0 @@
-# streams WG Meeting 2015-01-30
-
-## Links
-
-* **Google Hangouts Video**: http://www.youtube.com/watch?v=I9nDOSGfwZg
-* **GitHub Issue**: https://github.com/iojs/readable-stream/issues/106
-* **Original Minutes Google Doc**: https://docs.google.com/document/d/17aTgLnjMXIrfjgNaTUnHQO7m3xgzHR2VXBTmi03Qii4/
-
-## Agenda
-
-Extracted from https://github.com/iojs/readable-stream/labels/wg-agenda prior to meeting.
-
-* adopt a charter [#105](https://github.com/iojs/readable-stream/issues/105)
-* release and versioning strategy [#101](https://github.com/iojs/readable-stream/issues/101)
-* simpler stream creation [#102](https://github.com/iojs/readable-stream/issues/102)
-* proposal: deprecate implicit flowing of streams [#99](https://github.com/iojs/readable-stream/issues/99)
-
-## Minutes
-
-### adopt a charter
-
-* group: +1's all around
-
-### What versioning scheme should be adopted?
-* group: +1’s 3.0.0
-* domenic+group: pulling in patches from other sources where appropriate
-* mikeal: version independently, suggesting versions for io.js
-* mikeal+domenic: work with TC to notify in advance of changes
-simpler stream creation
-
-### streamline creation of streams
-* sam: streamline creation of streams
-* domenic: nice simple solution posted
-  but, we lose the opportunity to change the model
-  may not be backwards incompatible (double check keys)
-
-  **action item:** domenic will check
-
-### remove implicit flowing of streams on(‘data’)
-* add isFlowing / isPaused
-* mikeal: worrying that we’re documenting polyfill methods – confuses users
-* domenic: more reflective API is probably good, with warning labels for users
-* new section for mad scientists (reflective stream access)
-* calvin: name the “third state”
-* mikeal: maybe borrow the name from whatwg?
-* domenic: we’re missing the “third state”
-* consensus: kind of difficult to name the third state
-* mikeal: figure out differences in states / compat
-* mathias: always flow on data – eliminates third state
-  * explore what it breaks
-
-**action items:**
-* ask isaac for ability to list packages by what public io.js APIs they use (esp. Stream)
-* ask rod/build for infrastructure
-* **chris**: explore the “flow on data” approach
-* add isPaused/isFlowing
-* add new docs section
-* move isPaused to that section
-
-
diff --git a/node_modules/bl/node_modules/readable-stream/duplex.js b/node_modules/bl/node_modules/readable-stream/duplex.js
deleted file mode 100644
index ca807af87..000000000
--- a/node_modules/bl/node_modules/readable-stream/duplex.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = require("./lib/_stream_duplex.js")
diff --git a/node_modules/bl/node_modules/readable-stream/lib/_stream_duplex.js b/node_modules/bl/node_modules/readable-stream/lib/_stream_duplex.js
deleted file mode 100644
index 736693b84..000000000
--- a/node_modules/bl/node_modules/readable-stream/lib/_stream_duplex.js
+++ /dev/null
@@ -1,75 +0,0 @@
-// a duplex stream is just a stream that is both readable and writable.
-// Since JS doesn't have multiple prototypal inheritance, this class
-// prototypally inherits from Readable, and then parasitically from
-// Writable.
-
-'use strict';
-
-/*<replacement>*/
-
-var objectKeys = Object.keys || function (obj) {
-  var keys = [];
-  for (var key in obj) {
-    keys.push(key);
-  }return keys;
-};
-/*</replacement>*/
-
-module.exports = Duplex;
-
-/*<replacement>*/
-var processNextTick = require('process-nextick-args');
-/*</replacement>*/
-
-/*<replacement>*/
-var util = require('core-util-is');
-util.inherits = require('inherits');
-/*</replacement>*/
-
-var Readable = require('./_stream_readable');
-var Writable = require('./_stream_writable');
-
-util.inherits(Duplex, Readable);
-
-var keys = objectKeys(Writable.prototype);
-for (var v = 0; v < keys.length; v++) {
-  var method = keys[v];
-  if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];
-}
-
-function Duplex(options) {
-  if (!(this instanceof Duplex)) return new Duplex(options);
-
-  Readable.call(this, options);
-  Writable.call(this, options);
-
-  if (options && options.readable === false) this.readable = false;
-
-  if (options && options.writable === false) this.writable = false;
-
-  this.allowHalfOpen = true;
-  if (options && options.allowHalfOpen === false) this.allowHalfOpen = false;
-
-  this.once('end', onend);
-}
-
-// the no-half-open enforcer
-function onend() {
-  // if we allow half-open state, or if the writable side ended,
-  // then we're ok.
-  if (this.allowHalfOpen || this._writableState.ended) return;
-
-  // no more data can be written.
-  // But allow more writes to happen in this tick.
-  processNextTick(onEndNT, this);
-}
-
-function onEndNT(self) {
-  self.end();
-}
-
-function forEach(xs, f) {
-  for (var i = 0, l = xs.length; i < l; i++) {
-    f(xs[i], i);
-  }
-}
\ No newline at end of file
diff --git a/node_modules/bl/node_modules/readable-stream/lib/_stream_passthrough.js b/node_modules/bl/node_modules/readable-stream/lib/_stream_passthrough.js
deleted file mode 100644
index d06f71f18..000000000
--- a/node_modules/bl/node_modules/readable-stream/lib/_stream_passthrough.js
+++ /dev/null
@@ -1,26 +0,0 @@
-// a passthrough stream.
-// basically just the most minimal sort of Transform stream.
-// Every written chunk gets output as-is.
-
-'use strict';
-
-module.exports = PassThrough;
-
-var Transform = require('./_stream_transform');
-
-/*<replacement>*/
-var util = require('core-util-is');
-util.inherits = require('inherits');
-/*</replacement>*/
-
-util.inherits(PassThrough, Transform);
-
-function PassThrough(options) {
-  if (!(this instanceof PassThrough)) return new PassThrough(options);
-
-  Transform.call(this, options);
-}
-
-PassThrough.prototype._transform = function (chunk, encoding, cb) {
-  cb(null, chunk);
-};
\ No newline at end of file
diff --git a/node_modules/bl/node_modules/readable-stream/lib/_stream_readable.js b/node_modules/bl/node_modules/readable-stream/lib/_stream_readable.js
deleted file mode 100644
index 54a9d5c55..000000000
--- a/node_modules/bl/node_modules/readable-stream/lib/_stream_readable.js
+++ /dev/null
@@ -1,880 +0,0 @@
-'use strict';
-
-module.exports = Readable;
-
-/*<replacement>*/
-var processNextTick = require('process-nextick-args');
-/*</replacement>*/
-
-/*<replacement>*/
-var isArray = require('isarray');
-/*</replacement>*/
-
-/*<replacement>*/
-var Buffer = require('buffer').Buffer;
-/*</replacement>*/
-
-Readable.ReadableState = ReadableState;
-
-var EE = require('events');
-
-/*<replacement>*/
-var EElistenerCount = function (emitter, type) {
-  return emitter.listeners(type).length;
-};
-/*</replacement>*/
-
-/*<replacement>*/
-var Stream;
-(function () {
-  try {
-    Stream = require('st' + 'ream');
-  } catch (_) {} finally {
-    if (!Stream) Stream = require('events').EventEmitter;
-  }
-})();
-/*</replacement>*/
-
-var Buffer = require('buffer').Buffer;
-
-/*<replacement>*/
-var util = require('core-util-is');
-util.inherits = require('inherits');
-/*</replacement>*/
-
-/*<replacement>*/
-var debugUtil = require('util');
-var debug = undefined;
-if (debugUtil && debugUtil.debuglog) {
-  debug = debugUtil.debuglog('stream');
-} else {
-  debug = function () {};
-}
-/*</replacement>*/
-
-var StringDecoder;
-
-util.inherits(Readable, Stream);
-
-var Duplex;
-function ReadableState(options, stream) {
-  Duplex = Duplex || require('./_stream_duplex');
-
-  options = options || {};
-
-  // object stream flag. Used to make read(n) ignore n and to
-  // make all the buffer merging and length checks go away
-  this.objectMode = !!options.objectMode;
-
-  if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.readableObjectMode;
-
-  // the point at which it stops calling _read() to fill the buffer
-  // Note: 0 is a valid value, means "don't call _read preemptively ever"
-  var hwm = options.highWaterMark;
-  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
-  this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;
-
-  // cast to ints.
-  this.highWaterMark = ~ ~this.highWaterMark;
-
-  this.buffer = [];
-  this.length = 0;
-  this.pipes = null;
-  this.pipesCount = 0;
-  this.flowing = null;
-  this.ended = false;
-  this.endEmitted = false;
-  this.reading = false;
-
-  // a flag to be able to tell if the onwrite cb is called immediately,
-  // or on a later tick.  We set this to true at first, because any
-  // actions that shouldn't happen until "later" should generally also
-  // not happen before the first write call.
-  this.sync = true;
-
-  // whenever we return null, then we set a flag to say
-  // that we're awaiting a 'readable' event emission.
-  this.needReadable = false;
-  this.emittedReadable = false;
-  this.readableListening = false;
-  this.resumeScheduled = false;
-
-  // Crypto is kind of old and crusty.  Historically, its default string
-  // encoding is 'binary' so we have to make this configurable.
-  // Everything else in the universe uses 'utf8', though.
-  this.defaultEncoding = options.defaultEncoding || 'utf8';
-
-  // when piping, we only care about 'readable' events that happen
-  // after read()ing all the bytes and not getting any pushback.
-  this.ranOut = false;
-
-  // the number of writers that are awaiting a drain event in .pipe()s
-  this.awaitDrain = 0;
-
-  // if true, a maybeReadMore has been scheduled
-  this.readingMore = false;
-
-  this.decoder = null;
-  this.encoding = null;
-  if (options.encoding) {
-    if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
-    this.decoder = new StringDecoder(options.encoding);
-    this.encoding = options.encoding;
-  }
-}
-
-var Duplex;
-function Readable(options) {
-  Duplex = Duplex || require('./_stream_duplex');
-
-  if (!(this instanceof Readable)) return new Readable(options);
-
-  this._readableState = new ReadableState(options, this);
-
-  // legacy
-  this.readable = true;
-
-  if (options && typeof options.read === 'function') this._read = options.read;
-
-  Stream.call(this);
-}
-
-// Manually shove something into the read() buffer.
-// This returns true if the highWaterMark has not been hit yet,
-// similar to how Writable.write() returns true if you should
-// write() some more.
-Readable.prototype.push = function (chunk, encoding) {
-  var state = this._readableState;
-
-  if (!state.objectMode && typeof chunk === 'string') {
-    encoding = encoding || state.defaultEncoding;
-    if (encoding !== state.encoding) {
-      chunk = new Buffer(chunk, encoding);
-      encoding = '';
-    }
-  }
-
-  return readableAddChunk(this, state, chunk, encoding, false);
-};
-
-// Unshift should *always* be something directly out of read()
-Readable.prototype.unshift = function (chunk) {
-  var state = this._readableState;
-  return readableAddChunk(this, state, chunk, '', true);
-};
-
-Readable.prototype.isPaused = function () {
-  return this._readableState.flowing === false;
-};
-
-function readableAddChunk(stream, state, chunk, encoding, addToFront) {
-  var er = chunkInvalid(state, chunk);
-  if (er) {
-    stream.emit('error', er);
-  } else if (chunk === null) {
-    state.reading = false;
-    onEofChunk(stream, state);
-  } else if (state.objectMode || chunk && chunk.length > 0) {
-    if (state.ended && !addToFront) {
-      var e = new Error('stream.push() after EOF');
-      stream.emit('error', e);
-    } else if (state.endEmitted && addToFront) {
-      var e = new Error('stream.unshift() after end event');
-      stream.emit('error', e);
-    } else {
-      var skipAdd;
-      if (state.decoder && !addToFront && !encoding) {
-        chunk = state.decoder.write(chunk);
-        skipAdd = !state.objectMode && chunk.length === 0;
-      }
-
-      if (!addToFront) state.reading = false;
-
-      // Don't add to the buffer if we've decoded to an empty string chunk and
-      // we're not in object mode
-      if (!skipAdd) {
-        // if we want the data now, just emit it.
-        if (state.flowing && state.length === 0 && !state.sync) {
-          stream.emit('data', chunk);
-          stream.read(0);
-        } else {
-          // update the buffer info.
-          state.length += state.objectMode ? 1 : chunk.length;
-          if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);
-
-          if (state.needReadable) emitReadable(stream);
-        }
-      }
-
-      maybeReadMore(stream, state);
-    }
-  } else if (!addToFront) {
-    state.reading = false;
-  }
-
-  return needMoreData(state);
-}
-
-// if it's past the high water mark, we can push in some more.
-// Also, if we have no data yet, we can stand some
-// more bytes.  This is to work around cases where hwm=0,
-// such as the repl.  Also, if the push() triggered a
-// readable event, and the user called read(largeNumber) such that
-// needReadable was set, then we ought to push more, so that another
-// 'readable' event will be triggered.
-function needMoreData(state) {
-  return !state.ended && (state.needReadable || state.length < state.highWaterMark || state.length === 0);
-}
-
-// backwards compatibility.
-Readable.prototype.setEncoding = function (enc) {
-  if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
-  this._readableState.decoder = new StringDecoder(enc);
-  this._readableState.encoding = enc;
-  return this;
-};
-
-// Don't raise the hwm > 8MB
-var MAX_HWM = 0x800000;
-function computeNewHighWaterMark(n) {
-  if (n >= MAX_HWM) {
-    n = MAX_HWM;
-  } else {
-    // Get the next highest power of 2
-    n--;
-    n |= n >>> 1;
-    n |= n >>> 2;
-    n |= n >>> 4;
-    n |= n >>> 8;
-    n |= n >>> 16;
-    n++;
-  }
-  return n;
-}
-
-function howMuchToRead(n, state) {
-  if (state.length === 0 && state.ended) return 0;
-
-  if (state.objectMode) return n === 0 ? 0 : 1;
-
-  if (n === null || isNaN(n)) {
-    // only flow one buffer at a time
-    if (state.flowing && state.buffer.length) return state.buffer[0].length;else return state.length;
-  }
-
-  if (n <= 0) return 0;
-
-  // If we're asking for more than the target buffer level,
-  // then raise the water mark.  Bump up to the next highest
-  // power of 2, to prevent increasing it excessively in tiny
-  // amounts.
-  if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n);
-
-  // don't have that much.  return null, unless we've ended.
-  if (n > state.length) {
-    if (!state.ended) {
-      state.needReadable = true;
-      return 0;
-    } else {
-      return state.length;
-    }
-  }
-
-  return n;
-}
-
-// you can override either this method, or the async _read(n) below.
-Readable.prototype.read = function (n) {
-  debug('read', n);
-  var state = this._readableState;
-  var nOrig = n;
-
-  if (typeof n !== 'number' || n > 0) state.emittedReadable = false;
-
-  // if we're doing read(0) to trigger a readable event, but we
-  // already have a bunch of data in the buffer, then just trigger
-  // the 'readable' event and move on.
-  if (n === 0 && state.needReadable && (state.length >= state.highWaterMark || state.ended)) {
-    debug('read: emitReadable', state.length, state.ended);
-    if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this);
-    return null;
-  }
-
-  n = howMuchToRead(n, state);
-
-  // if we've ended, and we're now clear, then finish it up.
-  if (n === 0 && state.ended) {
-    if (state.length === 0) endReadable(this);
-    return null;
-  }
-
-  // All the actual chunk generation logic needs to be
-  // *below* the call to _read.  The reason is that in certain
-  // synthetic stream cases, such as passthrough streams, _read
-  // may be a completely synchronous operation which may change
-  // the state of the read buffer, providing enough data when
-  // before there was *not* enough.
-  //
-  // So, the steps are:
-  // 1. Figure out what the state of things will be after we do
-  // a read from the buffer.
-  //
-  // 2. If that resulting state will trigger a _read, then call _read.
-  // Note that this may be asynchronous, or synchronous.  Yes, it is
-  // deeply ugly to write APIs this way, but that still doesn't mean
-  // that the Readable class should behave improperly, as streams are
-  // designed to be sync/async agnostic.
-  // Take note if the _read call is sync or async (ie, if the read call
-  // has returned yet), so that we know whether or not it's safe to emit
-  // 'readable' etc.
-  //
-  // 3. Actually pull the requested chunks out of the buffer and return.
-
-  // if we need a readable event, then we need to do some reading.
-  var doRead = state.needReadable;
-  debug('need readable', doRead);
-
-  // if we currently have less than the highWaterMark, then also read some
-  if (state.length === 0 || state.length - n < state.highWaterMark) {
-    doRead = true;
-    debug('length less than watermark', doRead);
-  }
-
-  // however, if we've ended, then there's no point, and if we're already
-  // reading, then it's unnecessary.
-  if (state.ended || state.reading) {
-    doRead = false;
-    debug('reading or ended', doRead);
-  }
-
-  if (doRead) {
-    debug('do read');
-    state.reading = true;
-    state.sync = true;
-    // if the length is currently zero, then we *need* a readable event.
-    if (state.length === 0) state.needReadable = true;
-    // call internal read method
-    this._read(state.highWaterMark);
-    state.sync = false;
-  }
-
-  // If _read pushed data synchronously, then `reading` will be false,
-  // and we need to re-evaluate how much data we can return to the user.
-  if (doRead && !state.reading) n = howMuchToRead(nOrig, state);
-
-  var ret;
-  if (n > 0) ret = fromList(n, state);else ret = null;
-
-  if (ret === null) {
-    state.needReadable = true;
-    n = 0;
-  }
-
-  state.length -= n;
-
-  // If we have nothing in the buffer, then we want to know
-  // as soon as we *do* get something into the buffer.
-  if (state.length === 0 && !state.ended) state.needReadable = true;
-
-  // If we tried to read() past the EOF, then emit end on the next tick.
-  if (nOrig !== n && state.ended && state.length === 0) endReadable(this);
-
-  if (ret !== null) this.emit('data', ret);
-
-  return ret;
-};
-
-function chunkInvalid(state, chunk) {
-  var er = null;
-  if (!Buffer.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== null && chunk !== undefined && !state.objectMode) {
-    er = new TypeError('Invalid non-string/buffer chunk');
-  }
-  return er;
-}
-
-function onEofChunk(stream, state) {
-  if (state.ended) return;
-  if (state.decoder) {
-    var chunk = state.decoder.end();
-    if (chunk && chunk.length) {
-      state.buffer.push(chunk);
-      state.length += state.objectMode ? 1 : chunk.length;
-    }
-  }
-  state.ended = true;
-
-  // emit 'readable' now to make sure it gets picked up.
-  emitReadable(stream);
-}
-
-// Don't emit readable right away in sync mode, because this can trigger
-// another read() call => stack overflow.  This way, it might trigger
-// a nextTick recursion warning, but that's not so bad.
-function emitReadable(stream) {
-  var state = stream._readableState;
-  state.needReadable = false;
-  if (!state.emittedReadable) {
-    debug('emitReadable', state.flowing);
-    state.emittedReadable = true;
-    if (state.sync) processNextTick(emitReadable_, stream);else emitReadable_(stream);
-  }
-}
-
-function emitReadable_(stream) {
-  debug('emit readable');
-  stream.emit('readable');
-  flow(stream);
-}
-
-// at this point, the user has presumably seen the 'readable' event,
-// and called read() to consume some data.  that may have triggered
-// in turn another _read(n) call, in which case reading = true if
-// it's in progress.
-// However, if we're not ended, or reading, and the length < hwm,
-// then go ahead and try to read some more preemptively.
-function maybeReadMore(stream, state) {
-  if (!state.readingMore) {
-    state.readingMore = true;
-    processNextTick(maybeReadMore_, stream, state);
-  }
-}
-
-function maybeReadMore_(stream, state) {
-  var len = state.length;
-  while (!state.reading && !state.flowing && !state.ended && state.length < state.highWaterMark) {
-    debug('maybeReadMore read 0');
-    stream.read(0);
-    if (len === state.length)
-      // didn't get any data, stop spinning.
-      break;else len = state.length;
-  }
-  state.readingMore = false;
-}
-
-// abstract method.  to be overridden in specific implementation classes.
-// call cb(er, data) where data is <= n in length.
-// for virtual (non-string, non-buffer) streams, "length" is somewhat
-// arbitrary, and perhaps not very meaningful.
-Readable.prototype._read = function (n) {
-  this.emit('error', new Error('not implemented'));
-};
-
-Readable.prototype.pipe = function (dest, pipeOpts) {
-  var src = this;
-  var state = this._readableState;
-
-  switch (state.pipesCount) {
-    case 0:
-      state.pipes = dest;
-      break;
-    case 1:
-      state.pipes = [state.pipes, dest];
-      break;
-    default:
-      state.pipes.push(dest);
-      break;
-  }
-  state.pipesCount += 1;
-  debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);
-
-  var doEnd = (!pipeOpts || pipeOpts.end !== false) && dest !== process.stdout && dest !== process.stderr;
-
-  var endFn = doEnd ? onend : cleanup;
-  if (state.endEmitted) processNextTick(endFn);else src.once('end', endFn);
-
-  dest.on('unpipe', onunpipe);
-  function onunpipe(readable) {
-    debug('onunpipe');
-    if (readable === src) {
-      cleanup();
-    }
-  }
-
-  function onend() {
-    debug('onend');
-    dest.end();
-  }
-
-  // when the dest drains, it reduces the awaitDrain counter
-  // on the source.  This would be more elegant with a .once()
-  // handler in flow(), but adding and removing repeatedly is
-  // too slow.
-  var ondrain = pipeOnDrain(src);
-  dest.on('drain', ondrain);
-
-  var cleanedUp = false;
-  function cleanup() {
-    debug('cleanup');
-    // cleanup event handlers once the pipe is broken
-    dest.removeListener('close', onclose);
-    dest.removeListener('finish', onfinish);
-    dest.removeListener('drain', ondrain);
-    dest.removeListener('error', onerror);
-    dest.removeListener('unpipe', onunpipe);
-    src.removeListener('end', onend);
-    src.removeListener('end', cleanup);
-    src.removeListener('data', ondata);
-
-    cleanedUp = true;
-
-    // if the reader is waiting for a drain event from this
-    // specific writer, then it would cause it to never start
-    // flowing again.
-    // So, if this is awaiting a drain, then we just call it now.
-    // If we don't know, then assume that we are waiting for one.
-    if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain();
-  }
-
-  src.on('data', ondata);
-  function ondata(chunk) {
-    debug('ondata');
-    var ret = dest.write(chunk);
-    if (false === ret) {
-      // If the user unpiped during `dest.write()`, it is possible
-      // to get stuck in a permanently paused state if that write
-      // also returned false.
-      if (state.pipesCount === 1 && state.pipes[0] === dest && src.listenerCount('data') === 1 && !cleanedUp) {
-        debug('false write response, pause', src._readableState.awaitDrain);
-        src._readableState.awaitDrain++;
-      }
-      src.pause();
-    }
-  }
-
-  // if the dest has an error, then stop piping into it.
-  // however, don't suppress the throwing behavior for this.
-  function onerror(er) {
-    debug('onerror', er);
-    unpipe();
-    dest.removeListener('error', onerror);
-    if (EElistenerCount(dest, 'error') === 0) dest.emit('error', er);
-  }
-  // This is a brutally ugly hack to make sure that our error handler
-  // is attached before any userland ones.  NEVER DO THIS.
-  if (!dest._events || !dest._events.error) dest.on('error', onerror);else if (isArray(dest._events.error)) dest._events.error.unshift(onerror);else dest._events.error = [onerror, dest._events.error];
-
-  // Both close and finish should trigger unpipe, but only once.
-  function onclose() {
-    dest.removeListener('finish', onfinish);
-    unpipe();
-  }
-  dest.once('close', onclose);
-  function onfinish() {
-    debug('onfinish');
-    dest.removeListener('close', onclose);
-    unpipe();
-  }
-  dest.once('finish', onfinish);
-
-  function unpipe() {
-    debug('unpipe');
-    src.unpipe(dest);
-  }
-
-  // tell the dest that it's being piped to
-  dest.emit('pipe', src);
-
-  // start the flow if it hasn't been started already.
-  if (!state.flowing) {
-    debug('pipe resume');
-    src.resume();
-  }
-
-  return dest;
-};
-
-function pipeOnDrain(src) {
-  return function () {
-    var state = src._readableState;
-    debug('pipeOnDrain', state.awaitDrain);
-    if (state.awaitDrain) state.awaitDrain--;
-    if (state.awaitDrain === 0 && EElistenerCount(src, 'data')) {
-      state.flowing = true;
-      flow(src);
-    }
-  };
-}
-
-Readable.prototype.unpipe = function (dest) {
-  var state = this._readableState;
-
-  // if we're not piping anywhere, then do nothing.
-  if (state.pipesCount === 0) return this;
-
-  // just one destination.  most common case.
-  if (state.pipesCount === 1) {
-    // passed in one, but it's not the right one.
-    if (dest && dest !== state.pipes) return this;
-
-    if (!dest) dest = state.pipes;
-
-    // got a match.
-    state.pipes = null;
-    state.pipesCount = 0;
-    state.flowing = false;
-    if (dest) dest.emit('unpipe', this);
-    return this;
-  }
-
-  // slow case. multiple pipe destinations.
-
-  if (!dest) {
-    // remove all.
-    var dests = state.pipes;
-    var len = state.pipesCount;
-    state.pipes = null;
-    state.pipesCount = 0;
-    state.flowing = false;
-
-    for (var _i = 0; _i < len; _i++) {
-      dests[_i].emit('unpipe', this);
-    }return this;
-  }
-
-  // try to find the right one.
-  var i = indexOf(state.pipes, dest);
-  if (i === -1) return this;
-
-  state.pipes.splice(i, 1);
-  state.pipesCount -= 1;
-  if (state.pipesCount === 1) state.pipes = state.pipes[0];
-
-  dest.emit('unpipe', this);
-
-  return this;
-};
-
-// set up data events if they are asked for
-// Ensure readable listeners eventually get something
-Readable.prototype.on = function (ev, fn) {
-  var res = Stream.prototype.on.call(this, ev, fn);
-
-  // If listening to data, and it has not explicitly been paused,
-  // then call resume to start the flow of data on the next tick.
-  if (ev === 'data' && false !== this._readableState.flowing) {
-    this.resume();
-  }
-
-  if (ev === 'readable' && !this._readableState.endEmitted) {
-    var state = this._readableState;
-    if (!state.readableListening) {
-      state.readableListening = true;
-      state.emittedReadable = false;
-      state.needReadable = true;
-      if (!state.reading) {
-        processNextTick(nReadingNextTick, this);
-      } else if (state.length) {
-        emitReadable(this, state);
-      }
-    }
-  }
-
-  return res;
-};
-Readable.prototype.addListener = Readable.prototype.on;
-
-function nReadingNextTick(self) {
-  debug('readable nexttick read 0');
-  self.read(0);
-}
-
-// pause() and resume() are remnants of the legacy readable stream API
-// If the user uses them, then switch into old mode.
-Readable.prototype.resume = function () {
-  var state = this._readableState;
-  if (!state.flowing) {
-    debug('resume');
-    state.flowing = true;
-    resume(this, state);
-  }
-  return this;
-};
-
-function resume(stream, state) {
-  if (!state.resumeScheduled) {
-    state.resumeScheduled = true;
-    processNextTick(resume_, stream, state);
-  }
-}
-
-function resume_(stream, state) {
-  if (!state.reading) {
-    debug('resume read 0');
-    stream.read(0);
-  }
-
-  state.resumeScheduled = false;
-  stream.emit('resume');
-  flow(stream);
-  if (state.flowing && !state.reading) stream.read(0);
-}
-
-Readable.prototype.pause = function () {
-  debug('call pause flowing=%j', this._readableState.flowing);
-  if (false !== this._readableState.flowing) {
-    debug('pause');
-    this._readableState.flowing = false;
-    this.emit('pause');
-  }
-  return this;
-};
-
-function flow(stream) {
-  var state = stream._readableState;
-  debug('flow', state.flowing);
-  if (state.flowing) {
-    do {
-      var chunk = stream.read();
-    } while (null !== chunk && state.flowing);
-  }
-}
-
-// wrap an old-style stream as the async data source.
-// This is *not* part of the readable stream interface.
-// It is an ugly unfortunate mess of history.
-Readable.prototype.wrap = function (stream) {
-  var state = this._readableState;
-  var paused = false;
-
-  var self = this;
-  stream.on('end', function () {
-    debug('wrapped end');
-    if (state.decoder && !state.ended) {
-      var chunk = state.decoder.end();
-      if (chunk && chunk.length) self.push(chunk);
-    }
-
-    self.push(null);
-  });
-
-  stream.on('data', function (chunk) {
-    debug('wrapped data');
-    if (state.decoder) chunk = state.decoder.write(chunk);
-
-    // don't skip over falsy values in objectMode
-    if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return;
-
-    var ret = self.push(chunk);
-    if (!ret) {
-      paused = true;
-      stream.pause();
-    }
-  });
-
-  // proxy all the other methods.
-  // important when wrapping filters and duplexes.
-  for (var i in stream) {
-    if (this[i] === undefined && typeof stream[i] === 'function') {
-      this[i] = function (method) {
-        return function () {
-          return stream[method].apply(stream, arguments);
-        };
-      }(i);
-    }
-  }
-
-  // proxy certain important events.
-  var events = ['error', 'close', 'destroy', 'pause', 'resume'];
-  forEach(events, function (ev) {
-    stream.on(ev, self.emit.bind(self, ev));
-  });
-
-  // when we try to consume some more bytes, simply unpause the
-  // underlying stream.
-  self._read = function (n) {
-    debug('wrapped _read', n);
-    if (paused) {
-      paused = false;
-      stream.resume();
-    }
-  };
-
-  return self;
-};
-
-// exposed for testing purposes only.
-Readable._fromList = fromList;
-
-// Pluck off n bytes from an array of buffers.
-// Length is the combined lengths of all the buffers in the list.
-function fromList(n, state) {
-  var list = state.buffer;
-  var length = state.length;
-  var stringMode = !!state.decoder;
-  var objectMode = !!state.objectMode;
-  var ret;
-
-  // nothing in the list, definitely empty.
-  if (list.length === 0) return null;
-
-  if (length === 0) ret = null;else if (objectMode) ret = list.shift();else if (!n || n >= length) {
-    // read it all, truncate the array.
-    if (stringMode) ret = list.join('');else if (list.length === 1) ret = list[0];else ret = Buffer.concat(list, length);
-    list.length = 0;
-  } else {
-    // read just some of it.
-    if (n < list[0].length) {
-      // just take a part of the first list item.
-      // slice is the same for buffers and strings.
-      var buf = list[0];
-      ret = buf.slice(0, n);
-      list[0] = buf.slice(n);
-    } else if (n === list[0].length) {
-      // first list is a perfect match
-      ret = list.shift();
-    } else {
-      // complex case.
-      // we have enough to cover it, but it spans past the first buffer.
-      if (stringMode) ret = '';else ret = new Buffer(n);
-
-      var c = 0;
-      for (var i = 0, l = list.length; i < l && c < n; i++) {
-        var buf = list[0];
-        var cpy = Math.min(n - c, buf.length);
-
-        if (stringMode) ret += buf.slice(0, cpy);else buf.copy(ret, c, 0, cpy);
-
-        if (cpy < buf.length) list[0] = buf.slice(cpy);else list.shift();
-
-        c += cpy;
-      }
-    }
-  }
-
-  return ret;
-}
-
-function endReadable(stream) {
-  var state = stream._readableState;
-
-  // If we get here before consuming all the bytes, then that is a
-  // bug in node.  Should never happen.
-  if (state.length > 0) throw new Error('endReadable called on non-empty stream');
-
-  if (!state.endEmitted) {
-    state.ended = true;
-    processNextTick(endReadableNT, state, stream);
-  }
-}
-
-function endReadableNT(state, stream) {
-  // Check that we didn't get one last unshift.
-  if (!state.endEmitted && state.length === 0) {
-    state.endEmitted = true;
-    stream.readable = false;
-    stream.emit('end');
-  }
-}
-
-function forEach(xs, f) {
-  for (var i = 0, l = xs.length; i < l; i++) {
-    f(xs[i], i);
-  }
-}
-
-function indexOf(xs, x) {
-  for (var i = 0, l = xs.length; i < l; i++) {
-    if (xs[i] === x) return i;
-  }
-  return -1;
-}
\ No newline at end of file
diff --git a/node_modules/bl/node_modules/readable-stream/lib/_stream_transform.js b/node_modules/bl/node_modules/readable-stream/lib/_stream_transform.js
deleted file mode 100644
index 625cdc176..000000000
--- a/node_modules/bl/node_modules/readable-stream/lib/_stream_transform.js
+++ /dev/null
@@ -1,180 +0,0 @@
-// a transform stream is a readable/writable stream where you do
-// something with the data.  Sometimes it's called a "filter",
-// but that's not a great name for it, since that implies a thing where
-// some bits pass through, and others are simply ignored.  (That would
-// be a valid example of a transform, of course.)
-//
-// While the output is causally related to the input, it's not a
-// necessarily symmetric or synchronous transformation.  For example,
-// a zlib stream might take multiple plain-text writes(), and then
-// emit a single compressed chunk some time in the future.
-//
-// Here's how this works:
-//
-// The Transform stream has all the aspects of the readable and writable
-// stream classes.  When you write(chunk), that calls _write(chunk,cb)
-// internally, and returns false if there's a lot of pending writes
-// buffered up.  When you call read(), that calls _read(n) until
-// there's enough pending readable data buffered up.
-//
-// In a transform stream, the written data is placed in a buffer.  When
-// _read(n) is called, it transforms the queued up data, calling the
-// buffered _write cb's as it consumes chunks.  If consuming a single
-// written chunk would result in multiple output chunks, then the first
-// outputted bit calls the readcb, and subsequent chunks just go into
-// the read buffer, and will cause it to emit 'readable' if necessary.
-//
-// This way, back-pressure is actually determined by the reading side,
-// since _read has to be called to start processing a new chunk.  However,
-// a pathological inflate type of transform can cause excessive buffering
-// here.  For example, imagine a stream where every byte of input is
-// interpreted as an integer from 0-255, and then results in that many
-// bytes of output.  Writing the 4 bytes {ff,ff,ff,ff} would result in
-// 1kb of data being output.  In this case, you could write a very small
-// amount of input, and end up with a very large amount of output.  In
-// such a pathological inflating mechanism, there'd be no way to tell
-// the system to stop doing the transform.  A single 4MB write could
-// cause the system to run out of memory.
-//
-// However, even in such a pathological case, only a single written chunk
-// would be consumed, and then the rest would wait (un-transformed) until
-// the results of the previous transformed chunk were consumed.
-
-'use strict';
-
-module.exports = Transform;
-
-var Duplex = require('./_stream_duplex');
-
-/*<replacement>*/
-var util = require('core-util-is');
-util.inherits = require('inherits');
-/*</replacement>*/
-
-util.inherits(Transform, Duplex);
-
-function TransformState(stream) {
-  this.afterTransform = function (er, data) {
-    return afterTransform(stream, er, data);
-  };
-
-  this.needTransform = false;
-  this.transforming = false;
-  this.writecb = null;
-  this.writechunk = null;
-  this.writeencoding = null;
-}
-
-function afterTransform(stream, er, data) {
-  var ts = stream._transformState;
-  ts.transforming = false;
-
-  var cb = ts.writecb;
-
-  if (!cb) return stream.emit('error', new Error('no writecb in Transform class'));
-
-  ts.writechunk = null;
-  ts.writecb = null;
-
-  if (data !== null && data !== undefined) stream.push(data);
-
-  cb(er);
-
-  var rs = stream._readableState;
-  rs.reading = false;
-  if (rs.needReadable || rs.length < rs.highWaterMark) {
-    stream._read(rs.highWaterMark);
-  }
-}
-
-function Transform(options) {
-  if (!(this instanceof Transform)) return new Transform(options);
-
-  Duplex.call(this, options);
-
-  this._transformState = new TransformState(this);
-
-  // when the writable side finishes, then flush out anything remaining.
-  var stream = this;
-
-  // start out asking for a readable event once data is transformed.
-  this._readableState.needReadable = true;
-
-  // we have implemented the _read method, and done the other things
-  // that Readable wants before the first _read call, so unset the
-  // sync guard flag.
-  this._readableState.sync = false;
-
-  if (options) {
-    if (typeof options.transform === 'function') this._transform = options.transform;
-
-    if (typeof options.flush === 'function') this._flush = options.flush;
-  }
-
-  this.once('prefinish', function () {
-    if (typeof this._flush === 'function') this._flush(function (er) {
-      done(stream, er);
-    });else done(stream);
-  });
-}
-
-Transform.prototype.push = function (chunk, encoding) {
-  this._transformState.needTransform = false;
-  return Duplex.prototype.push.call(this, chunk, encoding);
-};
-
-// This is the part where you do stuff!
-// override this function in implementation classes.
-// 'chunk' is an input chunk.
-//
-// Call `push(newChunk)` to pass along transformed output
-// to the readable side.  You may call 'push' zero or more times.
-//
-// Call `cb(err)` when you are done with this chunk.  If you pass
-// an error, then that'll put the hurt on the whole operation.  If you
-// never call cb(), then you'll never get another chunk.
-Transform.prototype._transform = function (chunk, encoding, cb) {
-  throw new Error('not implemented');
-};
-
-Transform.prototype._write = function (chunk, encoding, cb) {
-  var ts = this._transformState;
-  ts.writecb = cb;
-  ts.writechunk = chunk;
-  ts.writeencoding = encoding;
-  if (!ts.transforming) {
-    var rs = this._readableState;
-    if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark);
-  }
-};
-
-// Doesn't matter what the args are here.
-// _transform does all the work.
-// That we got here means that the readable side wants more data.
-Transform.prototype._read = function (n) {
-  var ts = this._transformState;
-
-  if (ts.writechunk !== null && ts.writecb && !ts.transforming) {
-    ts.transforming = true;
-    this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);
-  } else {
-    // mark that we need a transform, so that any data that comes in
-    // will get processed, now that we've asked for it.
-    ts.needTransform = true;
-  }
-};
-
-function done(stream, er) {
-  if (er) return stream.emit('error', er);
-
-  // if there's nothing in the write buffer, then that means
-  // that nothing more will ever be provided
-  var ws = stream._writableState;
-  var ts = stream._transformState;
-
-  if (ws.length) throw new Error('calling transform done when ws.length != 0');
-
-  if (ts.transforming) throw new Error('calling transform done when still transforming');
-
-  return stream.push(null);
-}
\ No newline at end of file
diff --git a/node_modules/bl/node_modules/readable-stream/lib/_stream_writable.js b/node_modules/bl/node_modules/readable-stream/lib/_stream_writable.js
deleted file mode 100644
index 95916c992..000000000
--- a/node_modules/bl/node_modules/readable-stream/lib/_stream_writable.js
+++ /dev/null
@@ -1,516 +0,0 @@
-// A bit simpler than readable streams.
-// Implement an async ._write(chunk, encoding, cb), and it'll handle all
-// the drain event emission and buffering.
-
-'use strict';
-
-module.exports = Writable;
-
-/*<replacement>*/
-var processNextTick = require('process-nextick-args');
-/*</replacement>*/
-
-/*<replacement>*/
-var asyncWrite = !process.browser && ['v0.10', 'v0.9.'].indexOf(process.version.slice(0, 5)) > -1 ? setImmediate : processNextTick;
-/*</replacement>*/
-
-/*<replacement>*/
-var Buffer = require('buffer').Buffer;
-/*</replacement>*/
-
-Writable.WritableState = WritableState;
-
-/*<replacement>*/
-var util = require('core-util-is');
-util.inherits = require('inherits');
-/*</replacement>*/
-
-/*<replacement>*/
-var internalUtil = {
-  deprecate: require('util-deprecate')
-};
-/*</replacement>*/
-
-/*<replacement>*/
-var Stream;
-(function () {
-  try {
-    Stream = require('st' + 'ream');
-  } catch (_) {} finally {
-    if (!Stream) Stream = require('events').EventEmitter;
-  }
-})();
-/*</replacement>*/
-
-var Buffer = require('buffer').Buffer;
-
-util.inherits(Writable, Stream);
-
-function nop() {}
-
-function WriteReq(chunk, encoding, cb) {
-  this.chunk = chunk;
-  this.encoding = encoding;
-  this.callback = cb;
-  this.next = null;
-}
-
-var Duplex;
-function WritableState(options, stream) {
-  Duplex = Duplex || require('./_stream_duplex');
-
-  options = options || {};
-
-  // object stream flag to indicate whether or not this stream
-  // contains buffers or objects.
-  this.objectMode = !!options.objectMode;
-
-  if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.writableObjectMode;
-
-  // the point at which write() starts returning false
-  // Note: 0 is a valid value, means that we always return false if
-  // the entire buffer is not flushed immediately on write()
-  var hwm = options.highWaterMark;
-  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
-  this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;
-
-  // cast to ints.
-  this.highWaterMark = ~ ~this.highWaterMark;
-
-  this.needDrain = false;
-  // at the start of calling end()
-  this.ending = false;
-  // when end() has been called, and returned
-  this.ended = false;
-  // when 'finish' is emitted
-  this.finished = false;
-
-  // should we decode strings into buffers before passing to _write?
-  // this is here so that some node-core streams can optimize string
-  // handling at a lower level.
-  var noDecode = options.decodeStrings === false;
-  this.decodeStrings = !noDecode;
-
-  // Crypto is kind of old and crusty.  Historically, its default string
-  // encoding is 'binary' so we have to make this configurable.
-  // Everything else in the universe uses 'utf8', though.
-  this.defaultEncoding = options.defaultEncoding || 'utf8';
-
-  // not an actual buffer we keep track of, but a measurement
-  // of how much we're waiting to get pushed to some underlying
-  // socket or file.
-  this.length = 0;
-
-  // a flag to see when we're in the middle of a write.
-  this.writing = false;
-
-  // when true all writes will be buffered until .uncork() call
-  this.corked = 0;
-
-  // a flag to be able to tell if the onwrite cb is called immediately,
-  // or on a later tick.  We set this to true at first, because any
-  // actions that shouldn't happen until "later" should generally also
-  // not happen before the first write call.
-  this.sync = true;
-
-  // a flag to know if we're processing previously buffered items, which
-  // may call the _write() callback in the same tick, so that we don't
-  // end up in an overlapped onwrite situation.
-  this.bufferProcessing = false;
-
-  // the callback that's passed to _write(chunk,cb)
-  this.onwrite = function (er) {
-    onwrite(stream, er);
-  };
-
-  // the callback that the user supplies to write(chunk,encoding,cb)
-  this.writecb = null;
-
-  // the amount that is being written when _write is called.
-  this.writelen = 0;
-
-  this.bufferedRequest = null;
-  this.lastBufferedRequest = null;
-
-  // number of pending user-supplied write callbacks
-  // this must be 0 before 'finish' can be emitted
-  this.pendingcb = 0;
-
-  // emit prefinish if the only thing we're waiting for is _write cbs
-  // This is relevant for synchronous Transform streams
-  this.prefinished = false;
-
-  // True if the error was already emitted and should not be thrown again
-  this.errorEmitted = false;
-
-  // count buffered requests
-  this.bufferedRequestCount = 0;
-
-  // create the two objects needed to store the corked requests
-  // they are not a linked list, as no new elements are inserted in there
-  this.corkedRequestsFree = new CorkedRequest(this);
-  this.corkedRequestsFree.next = new CorkedRequest(this);
-}
-
-WritableState.prototype.getBuffer = function writableStateGetBuffer() {
-  var current = this.bufferedRequest;
-  var out = [];
-  while (current) {
-    out.push(current);
-    current = current.next;
-  }
-  return out;
-};
-
-(function () {
-  try {
-    Object.defineProperty(WritableState.prototype, 'buffer', {
-      get: internalUtil.deprecate(function () {
-        return this.getBuffer();
-      }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.')
-    });
-  } catch (_) {}
-})();
-
-var Duplex;
-function Writable(options) {
-  Duplex = Duplex || require('./_stream_duplex');
-
-  // Writable ctor is applied to Duplexes, though they're not
-  // instanceof Writable, they're instanceof Readable.
-  if (!(this instanceof Writable) && !(this instanceof Duplex)) return new Writable(options);
-
-  this._writableState = new WritableState(options, this);
-
-  // legacy.
-  this.writable = true;
-
-  if (options) {
-    if (typeof options.write === 'function') this._write = options.write;
-
-    if (typeof options.writev === 'function') this._writev = options.writev;
-  }
-
-  Stream.call(this);
-}
-
-// Otherwise people can pipe Writable streams, which is just wrong.
-Writable.prototype.pipe = function () {
-  this.emit('error', new Error('Cannot pipe. Not readable.'));
-};
-
-function writeAfterEnd(stream, cb) {
-  var er = new Error('write after end');
-  // TODO: defer error events consistently everywhere, not just the cb
-  stream.emit('error', er);
-  processNextTick(cb, er);
-}
-
-// If we get something that is not a buffer, string, null, or undefined,
-// and we're not in objectMode, then that's an error.
-// Otherwise stream chunks are all considered to be of length=1, and the
-// watermarks determine how many objects to keep in the buffer, rather than
-// how many bytes or characters.
-function validChunk(stream, state, chunk, cb) {
-  var valid = true;
-
-  if (!Buffer.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== null && chunk !== undefined && !state.objectMode) {
-    var er = new TypeError('Invalid non-string/buffer chunk');
-    stream.emit('error', er);
-    processNextTick(cb, er);
-    valid = false;
-  }
-  return valid;
-}
-
-Writable.prototype.write = function (chunk, encoding, cb) {
-  var state = this._writableState;
-  var ret = false;
-
-  if (typeof encoding === 'function') {
-    cb = encoding;
-    encoding = null;
-  }
-
-  if (Buffer.isBuffer(chunk)) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding;
-
-  if (typeof cb !== 'function') cb = nop;
-
-  if (state.ended) writeAfterEnd(this, cb);else if (validChunk(this, state, chunk, cb)) {
-    state.pendingcb++;
-    ret = writeOrBuffer(this, state, chunk, encoding, cb);
-  }
-
-  return ret;
-};
-
-Writable.prototype.cork = function () {
-  var state = this._writableState;
-
-  state.corked++;
-};
-
-Writable.prototype.uncork = function () {
-  var state = this._writableState;
-
-  if (state.corked) {
-    state.corked--;
-
-    if (!state.writing && !state.corked && !state.finished && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state);
-  }
-};
-
-Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {
-  // node::ParseEncoding() requires lower case.
-  if (typeof encoding === 'string') encoding = encoding.toLowerCase();
-  if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new TypeError('Unknown encoding: ' + encoding);
-  this._writableState.defaultEncoding = encoding;
-};
-
-function decodeChunk(state, chunk, encoding) {
-  if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {
-    chunk = new Buffer(chunk, encoding);
-  }
-  return chunk;
-}
-
-// if we're already writing something, then just put this
-// in the queue, and wait our turn.  Otherwise, call _write
-// If we return false, then we need a drain event, so set that flag.
-function writeOrBuffer(stream, state, chunk, encoding, cb) {
-  chunk = decodeChunk(state, chunk, encoding);
-
-  if (Buffer.isBuffer(chunk)) encoding = 'buffer';
-  var len = state.objectMode ? 1 : chunk.length;
-
-  state.length += len;
-
-  var ret = state.length < state.highWaterMark;
-  // we must ensure that previous needDrain will not be reset to false.
-  if (!ret) state.needDrain = true;
-
-  if (state.writing || state.corked) {
-    var last = state.lastBufferedRequest;
-    state.lastBufferedRequest = new WriteReq(chunk, encoding, cb);
-    if (last) {
-      last.next = state.lastBufferedRequest;
-    } else {
-      state.bufferedRequest = state.lastBufferedRequest;
-    }
-    state.bufferedRequestCount += 1;
-  } else {
-    doWrite(stream, state, false, len, chunk, encoding, cb);
-  }
-
-  return ret;
-}
-
-function doWrite(stream, state, writev, len, chunk, encoding, cb) {
-  state.writelen = len;
-  state.writecb = cb;
-  state.writing = true;
-  state.sync = true;
-  if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite);
-  state.sync = false;
-}
-
-function onwriteError(stream, state, sync, er, cb) {
-  --state.pendingcb;
-  if (sync) processNextTick(cb, er);else cb(er);
-
-  stream._writableState.errorEmitted = true;
-  stream.emit('error', er);
-}
-
-function onwriteStateUpdate(state) {
-  state.writing = false;
-  state.writecb = null;
-  state.length -= state.writelen;
-  state.writelen = 0;
-}
-
-function onwrite(stream, er) {
-  var state = stream._writableState;
-  var sync = state.sync;
-  var cb = state.writecb;
-
-  onwriteStateUpdate(state);
-
-  if (er) onwriteError(stream, state, sync, er, cb);else {
-    // Check if we're actually ready to finish, but don't emit yet
-    var finished = needFinish(state);
-
-    if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {
-      clearBuffer(stream, state);
-    }
-
-    if (sync) {
-      /*<replacement>*/
-      asyncWrite(afterWrite, stream, state, finished, cb);
-      /*</replacement>*/
-    } else {
-        afterWrite(stream, state, finished, cb);
-      }
-  }
-}
-
-function afterWrite(stream, state, finished, cb) {
-  if (!finished) onwriteDrain(stream, state);
-  state.pendingcb--;
-  cb();
-  finishMaybe(stream, state);
-}
-
-// Must force callback to be called on nextTick, so that we don't
-// emit 'drain' before the write() consumer gets the 'false' return
-// value, and has a chance to attach a 'drain' listener.
-function onwriteDrain(stream, state) {
-  if (state.length === 0 && state.needDrain) {
-    state.needDrain = false;
-    stream.emit('drain');
-  }
-}
-
-// if there's something in the buffer waiting, then process it
-function clearBuffer(stream, state) {
-  state.bufferProcessing = true;
-  var entry = state.bufferedRequest;
-
-  if (stream._writev && entry && entry.next) {
-    // Fast case, write everything using _writev()
-    var l = state.bufferedRequestCount;
-    var buffer = new Array(l);
-    var holder = state.corkedRequestsFree;
-    holder.entry = entry;
-
-    var count = 0;
-    while (entry) {
-      buffer[count] = entry;
-      entry = entry.next;
-      count += 1;
-    }
-
-    doWrite(stream, state, true, state.length, buffer, '', holder.finish);
-
-    // doWrite is always async, defer these to save a bit of time
-    // as the hot path ends with doWrite
-    state.pendingcb++;
-    state.lastBufferedRequest = null;
-    state.corkedRequestsFree = holder.next;
-    holder.next = null;
-  } else {
-    // Slow case, write chunks one-by-one
-    while (entry) {
-      var chunk = entry.chunk;
-      var encoding = entry.encoding;
-      var cb = entry.callback;
-      var len = state.objectMode ? 1 : chunk.length;
-
-      doWrite(stream, state, false, len, chunk, encoding, cb);
-      entry = entry.next;
-      // if we didn't call the onwrite immediately, then
-      // it means that we need to wait until it does.
-      // also, that means that the chunk and cb are currently
-      // being processed, so move the buffer counter past them.
-      if (state.writing) {
-        break;
-      }
-    }
-
-    if (entry === null) state.lastBufferedRequest = null;
-  }
-
-  state.bufferedRequestCount = 0;
-  state.bufferedRequest = entry;
-  state.bufferProcessing = false;
-}
-
-Writable.prototype._write = function (chunk, encoding, cb) {
-  cb(new Error('not implemented'));
-};
-
-Writable.prototype._writev = null;
-
-Writable.prototype.end = function (chunk, encoding, cb) {
-  var state = this._writableState;
-
-  if (typeof chunk === 'function') {
-    cb = chunk;
-    chunk = null;
-    encoding = null;
-  } else if (typeof encoding === 'function') {
-    cb = encoding;
-    encoding = null;
-  }
-
-  if (chunk !== null && chunk !== undefined) this.write(chunk, encoding);
-
-  // .end() fully uncorks
-  if (state.corked) {
-    state.corked = 1;
-    this.uncork();
-  }
-
-  // ignore unnecessary end() calls.
-  if (!state.ending && !state.finished) endWritable(this, state, cb);
-};
-
-function needFinish(state) {
-  return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;
-}
-
-function prefinish(stream, state) {
-  if (!state.prefinished) {
-    state.prefinished = true;
-    stream.emit('prefinish');
-  }
-}
-
-function finishMaybe(stream, state) {
-  var need = needFinish(state);
-  if (need) {
-    if (state.pendingcb === 0) {
-      prefinish(stream, state);
-      state.finished = true;
-      stream.emit('finish');
-    } else {
-      prefinish(stream, state);
-    }
-  }
-  return need;
-}
-
-function endWritable(stream, state, cb) {
-  state.ending = true;
-  finishMaybe(stream, state);
-  if (cb) {
-    if (state.finished) processNextTick(cb);else stream.once('finish', cb);
-  }
-  state.ended = true;
-  stream.writable = false;
-}
-
-// It seems a linked list but it is not
-// there will be only 2 of these for each stream
-function CorkedRequest(state) {
-  var _this = this;
-
-  this.next = null;
-  this.entry = null;
-
-  this.finish = function (err) {
-    var entry = _this.entry;
-    _this.entry = null;
-    while (entry) {
-      var cb = entry.callback;
-      state.pendingcb--;
-      cb(err);
-      entry = entry.next;
-    }
-    if (state.corkedRequestsFree) {
-      state.corkedRequestsFree.next = _this;
-    } else {
-      state.corkedRequestsFree = _this;
-    }
-  };
-}
\ No newline at end of file
diff --git a/node_modules/bl/node_modules/readable-stream/package.json b/node_modules/bl/node_modules/readable-stream/package.json
deleted file mode 100644
index d77b090ec..000000000
--- a/node_modules/bl/node_modules/readable-stream/package.json
+++ /dev/null
@@ -1,37 +0,0 @@
-{
-  "name": "readable-stream",
-  "version": "2.0.6",
-  "description": "Streams3, a user-land copy of the stream library from Node.js",
-  "main": "readable.js",
-  "dependencies": {
-    "core-util-is": "~1.0.0",
-    "inherits": "~2.0.1",
-    "isarray": "~1.0.0",
-    "process-nextick-args": "~1.0.6",
-    "string_decoder": "~0.10.x",
-    "util-deprecate": "~1.0.1"
-  },
-  "devDependencies": {
-    "tap": "~0.2.6",
-    "tape": "~4.5.1",
-    "zuul": "~3.9.0"
-  },
-  "scripts": {
-    "test": "tap test/parallel/*.js test/ours/*.js",
-    "browser": "npm run write-zuul && zuul -- test/browser.js",
-    "write-zuul": "printf \"ui: tape\nbrowsers:\n  - name: $BROWSER_NAME\n    version: $BROWSER_VERSION\n\">.zuul.yml"
-  },
-  "repository": {
-    "type": "git",
-    "url": "git://github.com/nodejs/readable-stream"
-  },
-  "keywords": [
-    "readable",
-    "stream",
-    "pipe"
-  ],
-  "browser": {
-    "util": false
-  },
-  "license": "MIT"
-}
diff --git a/node_modules/bl/node_modules/readable-stream/passthrough.js b/node_modules/bl/node_modules/readable-stream/passthrough.js
deleted file mode 100644
index 27e8d8a55..000000000
--- a/node_modules/bl/node_modules/readable-stream/passthrough.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = require("./lib/_stream_passthrough.js")
diff --git a/node_modules/bl/node_modules/readable-stream/readable.js b/node_modules/bl/node_modules/readable-stream/readable.js
deleted file mode 100644
index 6222a5798..000000000
--- a/node_modules/bl/node_modules/readable-stream/readable.js
+++ /dev/null
@@ -1,12 +0,0 @@
-var Stream = (function (){
-  try {
-    return require('st' + 'ream'); // hack to fix a circular dependency issue when used with browserify
-  } catch(_){}
-}());
-exports = module.exports = require('./lib/_stream_readable.js');
-exports.Stream = Stream || exports;
-exports.Readable = exports;
-exports.Writable = require('./lib/_stream_writable.js');
-exports.Duplex = require('./lib/_stream_duplex.js');
-exports.Transform = require('./lib/_stream_transform.js');
-exports.PassThrough = require('./lib/_stream_passthrough.js');
diff --git a/node_modules/bl/node_modules/readable-stream/transform.js b/node_modules/bl/node_modules/readable-stream/transform.js
deleted file mode 100644
index 5d482f078..000000000
--- a/node_modules/bl/node_modules/readable-stream/transform.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = require("./lib/_stream_transform.js")
diff --git a/node_modules/bl/node_modules/readable-stream/writable.js b/node_modules/bl/node_modules/readable-stream/writable.js
deleted file mode 100644
index e1e9efdf3..000000000
--- a/node_modules/bl/node_modules/readable-stream/writable.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = require("./lib/_stream_writable.js")
diff --git a/node_modules/buffer-shims/index.js b/node_modules/buffer-shims/index.js
deleted file mode 100644
index 1cab4c05e..000000000
--- a/node_modules/buffer-shims/index.js
+++ /dev/null
@@ -1,108 +0,0 @@
-'use strict';
-
-var buffer = require('buffer');
-var Buffer = buffer.Buffer;
-var SlowBuffer = buffer.SlowBuffer;
-var MAX_LEN = buffer.kMaxLength || 2147483647;
-exports.alloc = function alloc(size, fill, encoding) {
-  if (typeof Buffer.alloc === 'function') {
-    return Buffer.alloc(size, fill, encoding);
-  }
-  if (typeof encoding === 'number') {
-    throw new TypeError('encoding must not be number');
-  }
-  if (typeof size !== 'number') {
-    throw new TypeError('size must be a number');
-  }
-  if (size > MAX_LEN) {
-    throw new RangeError('size is too large');
-  }
-  var enc = encoding;
-  var _fill = fill;
-  if (_fill === undefined) {
-    enc = undefined;
-    _fill = 0;
-  }
-  var buf = new Buffer(size);
-  if (typeof _fill === 'string') {
-    var fillBuf = new Buffer(_fill, enc);
-    var flen = fillBuf.length;
-    var i = -1;
-    while (++i < size) {
-      buf[i] = fillBuf[i % flen];
-    }
-  } else {
-    buf.fill(_fill);
-  }
-  return buf;
-}
-exports.allocUnsafe = function allocUnsafe(size) {
-  if (typeof Buffer.allocUnsafe === 'function') {
-    return Buffer.allocUnsafe(size);
-  }
-  if (typeof size !== 'number') {
-    throw new TypeError('size must be a number');
-  }
-  if (size > MAX_LEN) {
-    throw new RangeError('size is too large');
-  }
-  return new Buffer(size);
-}
-exports.from = function from(value, encodingOrOffset, length) {
-  if (typeof Buffer.from === 'function' && (!global.Uint8Array || Uint8Array.from !== Buffer.from)) {
-    return Buffer.from(value, encodingOrOffset, length);
-  }
-  if (typeof value === 'number') {
-    throw new TypeError('"value" argument must not be a number');
-  }
-  if (typeof value === 'string') {
-    return new Buffer(value, encodingOrOffset);
-  }
-  if (typeof ArrayBuffer !== 'undefined' && value instanceof ArrayBuffer) {
-    var offset = encodingOrOffset;
-    if (arguments.length === 1) {
-      return new Buffer(value);
-    }
-    if (typeof offset === 'undefined') {
-      offset = 0;
-    }
-    var len = length;
-    if (typeof len === 'undefined') {
-      len = value.byteLength - offset;
-    }
-    if (offset >= value.byteLength) {
-      throw new RangeError('\'offset\' is out of bounds');
-    }
-    if (len > value.byteLength - offset) {
-      throw new RangeError('\'length\' is out of bounds');
-    }
-    return new Buffer(value.slice(offset, offset + len));
-  }
-  if (Buffer.isBuffer(value)) {
-    var out = new Buffer(value.length);
-    value.copy(out, 0, 0, value.length);
-    return out;
-  }
-  if (value) {
-    if (Array.isArray(value) || (typeof ArrayBuffer !== 'undefined' && value.buffer instanceof ArrayBuffer) || 'length' in value) {
-      return new Buffer(value);
-    }
-    if (value.type === 'Buffer' && Array.isArray(value.data)) {
-      return new Buffer(value.data);
-    }
-  }
-
-  throw new TypeError('First argument must be a string, Buffer, ' + 'ArrayBuffer, Array, or array-like object.');
-}
-exports.allocUnsafeSlow = function allocUnsafeSlow(size) {
-  if (typeof Buffer.allocUnsafeSlow === 'function') {
-    return Buffer.allocUnsafeSlow(size);
-  }
-  if (typeof size !== 'number') {
-    throw new TypeError('size must be a number');
-  }
-  if (size >= MAX_LEN) {
-    throw new RangeError('size is too large');
-  }
-  return new SlowBuffer(size);
-}
diff --git a/node_modules/buffer-shims/license.md b/node_modules/buffer-shims/license.md
deleted file mode 100644
index 01cfaefe2..000000000
--- a/node_modules/buffer-shims/license.md
+++ /dev/null
@@ -1,19 +0,0 @@
-# Copyright (c) 2016 Calvin Metcalf
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-**THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.**
diff --git a/node_modules/buffer-shims/package.json b/node_modules/buffer-shims/package.json
deleted file mode 100644
index be34aa460..000000000
--- a/node_modules/buffer-shims/package.json
+++ /dev/null
@@ -1,18 +0,0 @@
-{
-  "name": "buffer-shims",
-  "version": "1.0.0",
-  "description": "some shims for node buffers",
-  "main": "index.js",
-  "scripts": {
-    "test": "tape test/*.js"
-  },
-  "files": ["index.js"],
-  "license": "MIT",
-  "devDependencies": {
-    "tape": "^4.5.1"
-  },
-  "repository": {
-    "type": "git",
-    "url": "git@github.com:calvinmetcalf/buffer-shims.git"
-  }
-}
diff --git a/node_modules/buffer-shims/readme.md b/node_modules/buffer-shims/readme.md
deleted file mode 100644
index 7ea6475e2..000000000
--- a/node_modules/buffer-shims/readme.md
+++ /dev/null
@@ -1,21 +0,0 @@
-buffer-shims
-===
-
-functions to make sure the new buffer methods work in older browsers.
-
-```js
-var bufferShim = require('buffer-shims');
-bufferShim.from('foo');
-bufferShim.alloc(9, 'cafeface', 'hex');
-bufferShim.allocUnsafe(15);
-bufferShim.allocUnsafeSlow(21);
-```
-
-should just use the original  in newer nodes and on older nodes uses fallbacks.
-
-Known Issues
-===
-- this does not patch the buffer object, only the constructor stuff
-- it's actually a polyfill
-
-![](https://i.imgur.com/zxII3jJ.gif)
diff --git a/node_modules/chalk/node_modules/escape-string-regexp/index.js b/node_modules/chalk/node_modules/escape-string-regexp/index.js
deleted file mode 100644
index 7834bf9b2..000000000
--- a/node_modules/chalk/node_modules/escape-string-regexp/index.js
+++ /dev/null
@@ -1,11 +0,0 @@
-'use strict';
-
-var matchOperatorsRe = /[|\\{}()[\]^$+*?.]/g;
-
-module.exports = function (str) {
-	if (typeof str !== 'string') {
-		throw new TypeError('Expected a string');
-	}
-
-	return str.replace(matchOperatorsRe, '\\$&');
-};
diff --git a/node_modules/chalk/node_modules/escape-string-regexp/license b/node_modules/chalk/node_modules/escape-string-regexp/license
deleted file mode 100644
index 654d0bfe9..000000000
--- a/node_modules/chalk/node_modules/escape-string-regexp/license
+++ /dev/null
@@ -1,21 +0,0 @@
-The MIT License (MIT)
-
-Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (sindresorhus.com)
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
diff --git a/node_modules/chalk/node_modules/escape-string-regexp/package.json b/node_modules/chalk/node_modules/escape-string-regexp/package.json
deleted file mode 100644
index f307df34a..000000000
--- a/node_modules/chalk/node_modules/escape-string-regexp/package.json
+++ /dev/null
@@ -1,41 +0,0 @@
-{
-  "name": "escape-string-regexp",
-  "version": "1.0.5",
-  "description": "Escape RegExp special characters",
-  "license": "MIT",
-  "repository": "sindresorhus/escape-string-regexp",
-  "author": {
-    "name": "Sindre Sorhus",
-    "email": "sindresorhus@gmail.com",
-    "url": "sindresorhus.com"
-  },
-  "maintainers": [
-    "Sindre Sorhus <sindresorhus@gmail.com> (sindresorhus.com)",
-    "Joshua Boy Nicolai Appelman <joshua@jbna.nl> (jbna.nl)"
-  ],
-  "engines": {
-    "node": ">=0.8.0"
-  },
-  "scripts": {
-    "test": "xo && ava"
-  },
-  "files": [
-    "index.js"
-  ],
-  "keywords": [
-    "escape",
-    "regex",
-    "regexp",
-    "re",
-    "regular",
-    "expression",
-    "string",
-    "str",
-    "special",
-    "characters"
-  ],
-  "devDependencies": {
-    "ava": "*",
-    "xo": "*"
-  }
-}
diff --git a/node_modules/chalk/node_modules/escape-string-regexp/readme.md b/node_modules/chalk/node_modules/escape-string-regexp/readme.md
deleted file mode 100644
index 87ac82d5e..000000000
--- a/node_modules/chalk/node_modules/escape-string-regexp/readme.md
+++ /dev/null
@@ -1,27 +0,0 @@
-# escape-string-regexp [![Build Status](https://travis-ci.org/sindresorhus/escape-string-regexp.svg?branch=master)](https://travis-ci.org/sindresorhus/escape-string-regexp)
-
-> Escape RegExp special characters
-
-
-## Install
-
-```
-$ npm install --save escape-string-regexp
-```
-
-
-## Usage
-
-```js
-const escapeStringRegexp = require('escape-string-regexp');
-
-const escapedString = escapeStringRegexp('how much $ for a unicorn?');
-//=> 'how much \$ for a unicorn\?'
-
-new RegExp(escapedString);
-```
-
-
-## License
-
-MIT © [Sindre Sorhus](http://sindresorhus.com)
diff --git a/node_modules/concat-stream/node_modules/readable-stream/.npmignore b/node_modules/concat-stream/node_modules/readable-stream/.npmignore
deleted file mode 100644
index 38344f87a..000000000
--- a/node_modules/concat-stream/node_modules/readable-stream/.npmignore
+++ /dev/null
@@ -1,5 +0,0 @@
-build/
-test/
-examples/
-fs.js
-zlib.js
\ No newline at end of file
diff --git a/node_modules/concat-stream/node_modules/readable-stream/.travis.yml b/node_modules/concat-stream/node_modules/readable-stream/.travis.yml
deleted file mode 100644
index 1b8211846..000000000
--- a/node_modules/concat-stream/node_modules/readable-stream/.travis.yml
+++ /dev/null
@@ -1,52 +0,0 @@
-sudo: false
-language: node_js
-before_install:
-  - npm install -g npm@2
-  - npm install -g npm
-notifications:
-  email: false
-matrix:
-  fast_finish: true
-  allow_failures:
-    - env: TASK=browser BROWSER_NAME=ipad BROWSER_VERSION="6.0..latest"
-    - env: TASK=browser BROWSER_NAME=iphone BROWSER_VERSION="6.0..latest"
-  include:
-  - node_js: '0.8'
-    env: TASK=test
-  - node_js: '0.10'
-    env: TASK=test
-  - node_js: '0.11'
-    env: TASK=test
-  - node_js: '0.12'
-    env: TASK=test
-  - node_js: 1
-    env: TASK=test
-  - node_js: 2
-    env: TASK=test
-  - node_js: 3
-    env: TASK=test
-  - node_js: 4
-    env: TASK=test
-  - node_js: 5
-    env: TASK=test
-  - node_js: 5
-    env: TASK=browser BROWSER_NAME=android BROWSER_VERSION="4.0..latest"
-  - node_js: 5
-    env: TASK=browser BROWSER_NAME=ie BROWSER_VERSION="9..latest"
-  - node_js: 5
-    env: TASK=browser BROWSER_NAME=opera BROWSER_VERSION="11..latest"
-  - node_js: 5
-    env: TASK=browser BROWSER_NAME=chrome BROWSER_VERSION="-3..latest"
-  - node_js: 5
-    env: TASK=browser BROWSER_NAME=firefox BROWSER_VERSION="-3..latest"
-  - node_js: 5
-    env: TASK=browser BROWSER_NAME=ipad BROWSER_VERSION="6.0..latest"
-  - node_js: 5
-    env: TASK=browser BROWSER_NAME=iphone BROWSER_VERSION="6.0..latest"
-  - node_js: 5
-    env: TASK=browser BROWSER_NAME=safari BROWSER_VERSION="5..latest"
-script: "npm run $TASK"
-env:
-  global:
-  - secure: rE2Vvo7vnjabYNULNyLFxOyt98BoJexDqsiOnfiD6kLYYsiQGfr/sbZkPMOFm9qfQG7pjqx+zZWZjGSswhTt+626C0t/njXqug7Yps4c3dFblzGfreQHp7wNX5TFsvrxd6dAowVasMp61sJcRnB2w8cUzoe3RAYUDHyiHktwqMc=
-  - secure: g9YINaKAdMatsJ28G9jCGbSaguXCyxSTy+pBO6Ch0Cf57ZLOTka3HqDj8p3nV28LUIHZ3ut5WO43CeYKwt4AUtLpBS3a0dndHdY6D83uY6b2qh5hXlrcbeQTq2cvw2y95F7hm4D1kwrgZ7ViqaKggRcEupAL69YbJnxeUDKWEdI=
diff --git a/node_modules/concat-stream/node_modules/readable-stream/.zuul.yml b/node_modules/concat-stream/node_modules/readable-stream/.zuul.yml
deleted file mode 100644
index 96d9cfbd3..000000000
--- a/node_modules/concat-stream/node_modules/readable-stream/.zuul.yml
+++ /dev/null
@@ -1 +0,0 @@
-ui: tape
diff --git a/node_modules/concat-stream/node_modules/readable-stream/LICENSE b/node_modules/concat-stream/node_modules/readable-stream/LICENSE
deleted file mode 100644
index e3d4e695a..000000000
--- a/node_modules/concat-stream/node_modules/readable-stream/LICENSE
+++ /dev/null
@@ -1,18 +0,0 @@
-Copyright Joyent, Inc. and other Node contributors. All rights reserved.
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to
-deal in the Software without restriction, including without limitation the
-rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
-sell copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
-FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
-IN THE SOFTWARE.
diff --git a/node_modules/concat-stream/node_modules/readable-stream/README.md b/node_modules/concat-stream/node_modules/readable-stream/README.md
deleted file mode 100644
index 86b95a3bf..000000000
--- a/node_modules/concat-stream/node_modules/readable-stream/README.md
+++ /dev/null
@@ -1,36 +0,0 @@
-# readable-stream
-
-***Node-core v5.8.0 streams for userland*** [![Build Status](https://travis-ci.org/nodejs/readable-stream.svg?branch=master)](https://travis-ci.org/nodejs/readable-stream)
-
-
-[![NPM](https://nodei.co/npm/readable-stream.png?downloads=true&downloadRank=true)](https://nodei.co/npm/readable-stream/)
-[![NPM](https://nodei.co/npm-dl/readable-stream.png?&months=6&height=3)](https://nodei.co/npm/readable-stream/)
-
-
-[![Sauce Test Status](https://saucelabs.com/browser-matrix/readable-stream.svg)](https://saucelabs.com/u/readable-stream)
-
-```bash
-npm install --save readable-stream
-```
-
-***Node-core streams for userland***
-
-This package is a mirror of the Streams2 and Streams3 implementations in
-Node-core, including [documentation](doc/stream.markdown).
-
-If you want to guarantee a stable streams base, regardless of what version of
-Node you, or the users of your libraries are using, use **readable-stream** *only* and avoid the *"stream"* module in Node-core, for background see [this blogpost](http://r.va.gg/2014/06/why-i-dont-use-nodes-core-stream-module.html).
-
-As of version 2.0.0 **readable-stream** uses semantic versioning.  
-
-# Streams WG Team Members
-
-* **Chris Dickinson** ([@chrisdickinson](https://github.com/chrisdickinson)) &lt;christopher.s.dickinson@gmail.com&gt;
-  - Release GPG key: 9554F04D7259F04124DE6B476D5A82AC7E37093B
-* **Calvin Metcalf** ([@calvinmetcalf](https://github.com/calvinmetcalf)) &lt;calvin.metcalf@gmail.com&gt;
-  - Release GPG key: F3EF5F62A87FC27A22E643F714CE4FF5015AA242
-* **Rod Vagg** ([@rvagg](https://github.com/rvagg)) &lt;rod@vagg.org&gt;
-  - Release GPG key: DD8F2338BAE7501E3DD5AC78C273792F7D83545D
-* **Sam Newman** ([@sonewman](https://github.com/sonewman)) &lt;newmansam@outlook.com&gt;
-* **Mathias Buus** ([@mafintosh](https://github.com/mafintosh)) &lt;mathiasbuus@gmail.com&gt;
-* **Domenic Denicola** ([@domenic](https://github.com/domenic)) &lt;d@domenic.me&gt;
diff --git a/node_modules/concat-stream/node_modules/readable-stream/doc/stream.markdown b/node_modules/concat-stream/node_modules/readable-stream/doc/stream.markdown
deleted file mode 100644
index 0bc3819e6..000000000
--- a/node_modules/concat-stream/node_modules/readable-stream/doc/stream.markdown
+++ /dev/null
@@ -1,1760 +0,0 @@
-# Stream
-
-    Stability: 2 - Stable
-
-A stream is an abstract interface implemented by various objects in
-Node.js. For example a [request to an HTTP server][http-incoming-message] is a
-stream, as is [`process.stdout`][]. Streams are readable, writable, or both. All
-streams are instances of [`EventEmitter`][].
-
-You can load the Stream base classes by doing `require('stream')`.
-There are base classes provided for [Readable][] streams, [Writable][]
-streams, [Duplex][] streams, and [Transform][] streams.
-
-This document is split up into 3 sections:
-
-1. The first section explains the parts of the API that you need to be
-   aware of to use streams in your programs.
-2. The second section explains the parts of the API that you need to
-   use if you implement your own custom streams yourself. The API is designed to
-   make this easy for you to do.
-3. The third section goes into more depth about how streams work,
-   including some of the internal mechanisms and functions that you
-   should probably not modify unless you definitely know what you are
-   doing.
-
-
-## API for Stream Consumers
-
-<!--type=misc-->
-
-Streams can be either [Readable][], [Writable][], or both ([Duplex][]).
-
-All streams are EventEmitters, but they also have other custom methods
-and properties depending on whether they are Readable, Writable, or
-Duplex.
-
-If a stream is both Readable and Writable, then it implements all of
-the methods and events. So, a [Duplex][] or [Transform][] stream is
-fully described by this API, though their implementation may be
-somewhat different.
-
-It is not necessary to implement Stream interfaces in order to consume
-streams in your programs. If you **are** implementing streaming
-interfaces in your own program, please also refer to
-[API for Stream Implementors][].
-
-Almost all Node.js programs, no matter how simple, use Streams in some
-way. Here is an example of using Streams in an Node.js program:
-
-```js
-const http = require('http');
-
-var server = http.createServer( (req, res) => {
-  // req is an http.IncomingMessage, which is a Readable Stream
-  // res is an http.ServerResponse, which is a Writable Stream
-
-  var body = '';
-  // we want to get the data as utf8 strings
-  // If you don't set an encoding, then you'll get Buffer objects
-  req.setEncoding('utf8');
-
-  // Readable streams emit 'data' events once a listener is added
-  req.on('data', (chunk) => {
-    body += chunk;
-  });
-
-  // the end event tells you that you have entire body
-  req.on('end', () => {
-    try {
-      var data = JSON.parse(body);
-    } catch (er) {
-      // uh oh!  bad json!
-      res.statusCode = 400;
-      return res.end(`error: ${er.message}`);
-    }
-
-    // write back something interesting to the user:
-    res.write(typeof data);
-    res.end();
-  });
-});
-
-server.listen(1337);
-
-// $ curl localhost:1337 -d '{}'
-// object
-// $ curl localhost:1337 -d '"foo"'
-// string
-// $ curl localhost:1337 -d 'not json'
-// error: Unexpected token o
-```
-
-### Class: stream.Duplex
-
-Duplex streams are streams that implement both the [Readable][] and
-[Writable][] interfaces.
-
-Examples of Duplex streams include:
-
-* [TCP sockets][]
-* [zlib streams][zlib]
-* [crypto streams][crypto]
-
-### Class: stream.Readable
-
-<!--type=class-->
-
-The Readable stream interface is the abstraction for a *source* of
-data that you are reading from. In other words, data comes *out* of a
-Readable stream.
-
-A Readable stream will not start emitting data until you indicate that
-you are ready to receive it.
-
-Readable streams have two "modes": a **flowing mode** and a **paused
-mode**. When in flowing mode, data is read from the underlying system
-and provided to your program as fast as possible. In paused mode, you
-must explicitly call [`stream.read()`][stream-read] to get chunks of data out.
-Streams start out in paused mode.
-
-**Note**: If no data event handlers are attached, and there are no
-[`stream.pipe()`][] destinations, and the stream is switched into flowing
-mode, then data will be lost.
-
-You can switch to flowing mode by doing any of the following:
-
-* Adding a [`'data'`][] event handler to listen for data.
-* Calling the [`stream.resume()`][stream-resume] method to explicitly open the
-  flow.
-* Calling the [`stream.pipe()`][] method to send the data to a [Writable][].
-
-You can switch back to paused mode by doing either of the following:
-
-* If there are no pipe destinations, by calling the
-  [`stream.pause()`][stream-pause] method.
-* If there are pipe destinations, by removing any [`'data'`][] event
-  handlers, and removing all pipe destinations by calling the
-  [`stream.unpipe()`][] method.
-
-Note that, for backwards compatibility reasons, removing [`'data'`][]
-event handlers will **not** automatically pause the stream. Also, if
-there are piped destinations, then calling [`stream.pause()`][stream-pause] will
-not guarantee that the stream will *remain* paused once those
-destinations drain and ask for more data.
-
-Examples of readable streams include:
-
-* [HTTP responses, on the client][http-incoming-message]
-* [HTTP requests, on the server][http-incoming-message]
-* [fs read streams][]
-* [zlib streams][zlib]
-* [crypto streams][crypto]
-* [TCP sockets][]
-* [child process stdout and stderr][]
-* [`process.stdin`][]
-
-#### Event: 'close'
-
-Emitted when the stream and any of its underlying resources (a file
-descriptor, for example) have been closed. The event indicates that
-no more events will be emitted, and no further computation will occur.
-
-Not all streams will emit the `'close'` event.
-
-#### Event: 'data'
-
-* `chunk` {Buffer|String} The chunk of data.
-
-Attaching a `'data'` event listener to a stream that has not been
-explicitly paused will switch the stream into flowing mode. Data will
-then be passed as soon as it is available.
-
-If you just want to get all the data out of the stream as fast as
-possible, this is the best way to do so.
-
-```js
-var readable = getReadableStreamSomehow();
-readable.on('data', (chunk) => {
-  console.log('got %d bytes of data', chunk.length);
-});
-```
-
-#### Event: 'end'
-
-This event fires when there will be no more data to read.
-
-Note that the `'end'` event **will not fire** unless the data is
-completely consumed. This can be done by switching into flowing mode,
-or by calling [`stream.read()`][stream-read] repeatedly until you get to the
-end.
-
-```js
-var readable = getReadableStreamSomehow();
-readable.on('data', (chunk) => {
-  console.log('got %d bytes of data', chunk.length);
-});
-readable.on('end', () => {
-  console.log('there will be no more data.');
-});
-```
-
-#### Event: 'error'
-
-* {Error Object}
-
-Emitted if there was an error receiving data.
-
-#### Event: 'readable'
-
-When a chunk of data can be read from the stream, it will emit a
-`'readable'` event.
-
-In some cases, listening for a `'readable'` event will cause some data
-to be read into the internal buffer from the underlying system, if it
-hadn't already.
-
-```javascript
-var readable = getReadableStreamSomehow();
-readable.on('readable', () => {
-  // there is some data to read now
-});
-```
-
-Once the internal buffer is drained, a `'readable'` event will fire
-again when more data is available.
-
-The `'readable'` event is not emitted in the "flowing" mode with the
-sole exception of the last one, on end-of-stream.
-
-The `'readable'` event indicates that the stream has new information:
-either new data is available or the end of the stream has been reached.
-In the former case, [`stream.read()`][stream-read] will return that data. In the
-latter case, [`stream.read()`][stream-read] will return null. For instance, in
-the following example, `foo.txt` is an empty file:
-
-```js
-const fs = require('fs');
-var rr = fs.createReadStream('foo.txt');
-rr.on('readable', () => {
-  console.log('readable:', rr.read());
-});
-rr.on('end', () => {
-  console.log('end');
-});
-```
-
-The output of running this script is:
-
-```
-$ node test.js
-readable: null
-end
-```
-
-#### readable.isPaused()
-
-* Return: {Boolean}
-
-This method returns whether or not the `readable` has been **explicitly**
-paused by client code (using [`stream.pause()`][stream-pause] without a
-corresponding [`stream.resume()`][stream-resume]).
-
-```js
-var readable = new stream.Readable
-
-readable.isPaused() // === false
-readable.pause()
-readable.isPaused() // === true
-readable.resume()
-readable.isPaused() // === false
-```
-
-#### readable.pause()
-
-* Return: `this`
-
-This method will cause a stream in flowing mode to stop emitting
-[`'data'`][] events, switching out of flowing mode. Any data that becomes
-available will remain in the internal buffer.
-
-```js
-var readable = getReadableStreamSomehow();
-readable.on('data', (chunk) => {
-  console.log('got %d bytes of data', chunk.length);
-  readable.pause();
-  console.log('there will be no more data for 1 second');
-  setTimeout(() => {
-    console.log('now data will start flowing again');
-    readable.resume();
-  }, 1000);
-});
-```
-
-#### readable.pipe(destination[, options])
-
-* `destination` {stream.Writable} The destination for writing data
-* `options` {Object} Pipe options
-  * `end` {Boolean} End the writer when the reader ends. Default = `true`
-
-This method pulls all the data out of a readable stream, and writes it
-to the supplied destination, automatically managing the flow so that
-the destination is not overwhelmed by a fast readable stream.
-
-Multiple destinations can be piped to safely.
-
-```js
-var readable = getReadableStreamSomehow();
-var writable = fs.createWriteStream('file.txt');
-// All the data from readable goes into 'file.txt'
-readable.pipe(writable);
-```
-
-This function returns the destination stream, so you can set up pipe
-chains like so:
-
-```js
-var r = fs.createReadStream('file.txt');
-var z = zlib.createGzip();
-var w = fs.createWriteStream('file.txt.gz');
-r.pipe(z).pipe(w);
-```
-
-For example, emulating the Unix `cat` command:
-
-```js
-process.stdin.pipe(process.stdout);
-```
-
-By default [`stream.end()`][stream-end] is called on the destination when the
-source stream emits [`'end'`][], so that `destination` is no longer writable.
-Pass `{ end: false }` as `options` to keep the destination stream open.
-
-This keeps `writer` open so that "Goodbye" can be written at the
-end.
-
-```js
-reader.pipe(writer, { end: false });
-reader.on('end', () => {
-  writer.end('Goodbye\n');
-});
-```
-
-Note that [`process.stderr`][] and [`process.stdout`][] are never closed until
-the process exits, regardless of the specified options.
-
-#### readable.read([size])
-
-* `size` {Number} Optional argument to specify how much data to read.
-* Return {String|Buffer|Null}
-
-The `read()` method pulls some data out of the internal buffer and
-returns it. If there is no data available, then it will return
-`null`.
-
-If you pass in a `size` argument, then it will return that many
-bytes. If `size` bytes are not available, then it will return `null`,
-unless we've ended, in which case it will return the data remaining
-in the buffer.
-
-If you do not specify a `size` argument, then it will return all the
-data in the internal buffer.
-
-This method should only be called in paused mode. In flowing mode,
-this method is called automatically until the internal buffer is
-drained.
-
-```js
-var readable = getReadableStreamSomehow();
-readable.on('readable', () => {
-  var chunk;
-  while (null !== (chunk = readable.read())) {
-    console.log('got %d bytes of data', chunk.length);
-  }
-});
-```
-
-If this method returns a data chunk, then it will also trigger the
-emission of a [`'data'`][] event.
-
-Note that calling [`stream.read([size])`][stream-read] after the [`'end'`][]
-event has been triggered will return `null`. No runtime error will be raised.
-
-#### readable.resume()
-
-* Return: `this`
-
-This method will cause the readable stream to resume emitting [`'data'`][]
-events.
-
-This method will switch the stream into flowing mode. If you do *not*
-want to consume the data from a stream, but you *do* want to get to
-its [`'end'`][] event, you can call [`stream.resume()`][stream-resume] to open
-the flow of data.
-
-```js
-var readable = getReadableStreamSomehow();
-readable.resume();
-readable.on('end', () => {
-  console.log('got to the end, but did not read anything');
-});
-```
-
-#### readable.setEncoding(encoding)
-
-* `encoding` {String} The encoding to use.
-* Return: `this`
-
-Call this function to cause the stream to return strings of the specified
-encoding instead of Buffer objects. For example, if you do
-`readable.setEncoding('utf8')`, then the output data will be interpreted as
-UTF-8 data, and returned as strings. If you do `readable.setEncoding('hex')`,
-then the data will be encoded in hexadecimal string format.
-
-This properly handles multi-byte characters that would otherwise be
-potentially mangled if you simply pulled the Buffers directly and
-called [`buf.toString(encoding)`][] on them. If you want to read the data
-as strings, always use this method.
-
-Also you can disable any encoding at all with `readable.setEncoding(null)`.
-This approach is very useful if you deal with binary data or with large
-multi-byte strings spread out over multiple chunks.
-
-```js
-var readable = getReadableStreamSomehow();
-readable.setEncoding('utf8');
-readable.on('data', (chunk) => {
-  assert.equal(typeof chunk, 'string');
-  console.log('got %d characters of string data', chunk.length);
-});
-```
-
-#### readable.unpipe([destination])
-
-* `destination` {stream.Writable} Optional specific stream to unpipe
-
-This method will remove the hooks set up for a previous [`stream.pipe()`][]
-call.
-
-If the destination is not specified, then all pipes are removed.
-
-If the destination is specified, but no pipe is set up for it, then
-this is a no-op.
-
-```js
-var readable = getReadableStreamSomehow();
-var writable = fs.createWriteStream('file.txt');
-// All the data from readable goes into 'file.txt',
-// but only for the first second
-readable.pipe(writable);
-setTimeout(() => {
-  console.log('stop writing to file.txt');
-  readable.unpipe(writable);
-  console.log('manually close the file stream');
-  writable.end();
-}, 1000);
-```
-
-#### readable.unshift(chunk)
-
-* `chunk` {Buffer|String} Chunk of data to unshift onto the read queue
-
-This is useful in certain cases where a stream is being consumed by a
-parser, which needs to "un-consume" some data that it has
-optimistically pulled out of the source, so that the stream can be
-passed on to some other party.
-
-Note that `stream.unshift(chunk)` cannot be called after the [`'end'`][] event
-has been triggered; a runtime error will be raised.
-
-If you find that you must often call `stream.unshift(chunk)` in your
-programs, consider implementing a [Transform][] stream instead. (See [API
-for Stream Implementors][].)
-
-```js
-// Pull off a header delimited by \n\n
-// use unshift() if we get too much
-// Call the callback with (error, header, stream)
-const StringDecoder = require('string_decoder').StringDecoder;
-function parseHeader(stream, callback) {
-  stream.on('error', callback);
-  stream.on('readable', onReadable);
-  var decoder = new StringDecoder('utf8');
-  var header = '';
-  function onReadable() {
-    var chunk;
-    while (null !== (chunk = stream.read())) {
-      var str = decoder.write(chunk);
-      if (str.match(/\n\n/)) {
-        // found the header boundary
-        var split = str.split(/\n\n/);
-        header += split.shift();
-        var remaining = split.join('\n\n');
-        var buf = new Buffer(remaining, 'utf8');
-        if (buf.length)
-          stream.unshift(buf);
-        stream.removeListener('error', callback);
-        stream.removeListener('readable', onReadable);
-        // now the body of the message can be read from the stream.
-        callback(null, header, stream);
-      } else {
-        // still reading the header.
-        header += str;
-      }
-    }
-  }
-}
-```
-
-Note that, unlike [`stream.push(chunk)`][stream-push], `stream.unshift(chunk)`
-will not end the reading process by resetting the internal reading state of the
-stream. This can cause unexpected results if `unshift()` is called during a
-read (i.e. from within a [`stream._read()`][stream-_read] implementation on a
-custom stream). Following the call to `unshift()` with an immediate
-[`stream.push('')`][stream-push] will reset the reading state appropriately,
-however it is best to simply avoid calling `unshift()` while in the process of
-performing a read.
-
-#### readable.wrap(stream)
-
-* `stream` {Stream} An "old style" readable stream
-
-Versions of Node.js prior to v0.10 had streams that did not implement the
-entire Streams API as it is today. (See [Compatibility][] for
-more information.)
-
-If you are using an older Node.js library that emits [`'data'`][] events and
-has a [`stream.pause()`][stream-pause] method that is advisory only, then you
-can use the `wrap()` method to create a [Readable][] stream that uses the old
-stream as its data source.
-
-You will very rarely ever need to call this function, but it exists
-as a convenience for interacting with old Node.js programs and libraries.
-
-For example:
-
-```js
-const OldReader = require('./old-api-module.js').OldReader;
-const Readable = require('stream').Readable;
-const oreader = new OldReader;
-const myReader = new Readable().wrap(oreader);
-
-myReader.on('readable', () => {
-  myReader.read(); // etc.
-});
-```
-
-### Class: stream.Transform
-
-Transform streams are [Duplex][] streams where the output is in some way
-computed from the input. They implement both the [Readable][] and
-[Writable][] interfaces.
-
-Examples of Transform streams include:
-
-* [zlib streams][zlib]
-* [crypto streams][crypto]
-
-### Class: stream.Writable
-
-<!--type=class-->
-
-The Writable stream interface is an abstraction for a *destination*
-that you are writing data *to*.
-
-Examples of writable streams include:
-
-* [HTTP requests, on the client][]
-* [HTTP responses, on the server][]
-* [fs write streams][]
-* [zlib streams][zlib]
-* [crypto streams][crypto]
-* [TCP sockets][]
-* [child process stdin][]
-* [`process.stdout`][], [`process.stderr`][]
-
-#### Event: 'drain'
-
-If a [`stream.write(chunk)`][stream-write] call returns `false`, then the
-`'drain'` event will indicate when it is appropriate to begin writing more data
-to the stream.
-
-```js
-// Write the data to the supplied writable stream one million times.
-// Be attentive to back-pressure.
-function writeOneMillionTimes(writer, data, encoding, callback) {
-  var i = 1000000;
-  write();
-  function write() {
-    var ok = true;
-    do {
-      i -= 1;
-      if (i === 0) {
-        // last time!
-        writer.write(data, encoding, callback);
-      } else {
-        // see if we should continue, or wait
-        // don't pass the callback, because we're not done yet.
-        ok = writer.write(data, encoding);
-      }
-    } while (i > 0 && ok);
-    if (i > 0) {
-      // had to stop early!
-      // write some more once it drains
-      writer.once('drain', write);
-    }
-  }
-}
-```
-
-#### Event: 'error'
-
-* {Error}
-
-Emitted if there was an error when writing or piping data.
-
-#### Event: 'finish'
-
-When the [`stream.end()`][stream-end] method has been called, and all data has
-been flushed to the underlying system, this event is emitted.
-
-```javascript
-var writer = getWritableStreamSomehow();
-for (var i = 0; i < 100; i ++) {
-  writer.write('hello, #${i}!\n');
-}
-writer.end('this is the end\n');
-writer.on('finish', () => {
-  console.error('all writes are now complete.');
-});
-```
-
-#### Event: 'pipe'
-
-* `src` {stream.Readable} source stream that is piping to this writable
-
-This is emitted whenever the [`stream.pipe()`][] method is called on a readable
-stream, adding this writable to its set of destinations.
-
-```js
-var writer = getWritableStreamSomehow();
-var reader = getReadableStreamSomehow();
-writer.on('pipe', (src) => {
-  console.error('something is piping into the writer');
-  assert.equal(src, reader);
-});
-reader.pipe(writer);
-```
-
-#### Event: 'unpipe'
-
-* `src` {[Readable][] Stream} The source stream that
-  [unpiped][`stream.unpipe()`] this writable
-
-This is emitted whenever the [`stream.unpipe()`][] method is called on a
-readable stream, removing this writable from its set of destinations.
-
-```js
-var writer = getWritableStreamSomehow();
-var reader = getReadableStreamSomehow();
-writer.on('unpipe', (src) => {
-  console.error('something has stopped piping into the writer');
-  assert.equal(src, reader);
-});
-reader.pipe(writer);
-reader.unpipe(writer);
-```
-
-#### writable.cork()
-
-Forces buffering of all writes.
-
-Buffered data will be flushed either at [`stream.uncork()`][] or at
-[`stream.end()`][stream-end] call.
-
-#### writable.end([chunk][, encoding][, callback])
-
-* `chunk` {String|Buffer} Optional data to write
-* `encoding` {String} The encoding, if `chunk` is a String
-* `callback` {Function} Optional callback for when the stream is finished
-
-Call this method when no more data will be written to the stream. If supplied,
-the callback is attached as a listener on the [`'finish'`][] event.
-
-Calling [`stream.write()`][stream-write] after calling
-[`stream.end()`][stream-end] will raise an error.
-
-```js
-// write 'hello, ' and then end with 'world!'
-var file = fs.createWriteStream('example.txt');
-file.write('hello, ');
-file.end('world!');
-// writing more now is not allowed!
-```
-
-#### writable.setDefaultEncoding(encoding)
-
-* `encoding` {String} The new default encoding
-
-Sets the default encoding for a writable stream.
-
-#### writable.uncork()
-
-Flush all data, buffered since [`stream.cork()`][] call.
-
-#### writable.write(chunk[, encoding][, callback])
-
-* `chunk` {String|Buffer} The data to write
-* `encoding` {String} The encoding, if `chunk` is a String
-* `callback` {Function} Callback for when this chunk of data is flushed
-* Returns: {Boolean} `true` if the data was handled completely.
-
-This method writes some data to the underlying system, and calls the
-supplied callback once the data has been fully handled.
-
-The return value indicates if you should continue writing right now.
-If the data had to be buffered internally, then it will return
-`false`. Otherwise, it will return `true`.
-
-This return value is strictly advisory. You MAY continue to write,
-even if it returns `false`. However, writes will be buffered in
-memory, so it is best not to do this excessively. Instead, wait for
-the [`'drain'`][] event before writing more data.
-
-
-## API for Stream Implementors
-
-<!--type=misc-->
-
-To implement any sort of stream, the pattern is the same:
-
-1. Extend the appropriate parent class in your own subclass. (The
-   [`util.inherits()`][] method is particularly helpful for this.)
-2. Call the appropriate parent class constructor in your constructor,
-   to be sure that the internal mechanisms are set up properly.
-3. Implement one or more specific methods, as detailed below.
-
-The class to extend and the method(s) to implement depend on the sort
-of stream class you are writing:
-
-<table>
-  <thead>
-    <tr>
-      <th>
-        <p>Use-case</p>
-      </th>
-      <th>
-        <p>Class</p>
-      </th>
-      <th>
-        <p>Method(s) to implement</p>
-      </th>
-    </tr>
-  </thead>
-  <tr>
-    <td>
-      <p>Reading only</p>
-    </td>
-    <td>
-      <p>[Readable](#stream_class_stream_readable_1)</p>
-    </td>
-    <td>
-      <p><code>[_read][stream-_read]</code></p>
-    </td>
-  </tr>
-  <tr>
-    <td>
-      <p>Writing only</p>
-    </td>
-    <td>
-      <p>[Writable](#stream_class_stream_writable_1)</p>
-    </td>
-    <td>
-      <p><code>[_write][stream-_write]</code>, <code>[_writev][stream-_writev]</code></p>
-    </td>
-  </tr>
-  <tr>
-    <td>
-      <p>Reading and writing</p>
-    </td>
-    <td>
-      <p>[Duplex](#stream_class_stream_duplex_1)</p>
-    </td>
-    <td>
-      <p><code>[_read][stream-_read]</code>, <code>[_write][stream-_write]</code>, <code>[_writev][stream-_writev]</code></p>
-    </td>
-  </tr>
-  <tr>
-    <td>
-      <p>Operate on written data, then read the result</p>
-    </td>
-    <td>
-      <p>[Transform](#stream_class_stream_transform_1)</p>
-    </td>
-    <td>
-      <p><code>[_transform][stream-_transform]</code>, <code>[_flush][stream-_flush]</code></p>
-    </td>
-  </tr>
-</table>
-
-In your implementation code, it is very important to never call the methods
-described in [API for Stream Consumers][]. Otherwise, you can potentially cause
-adverse side effects in programs that consume your streaming interfaces.
-
-### Class: stream.Duplex
-
-<!--type=class-->
-
-A "duplex" stream is one that is both Readable and Writable, such as a TCP
-socket connection.
-
-Note that `stream.Duplex` is an abstract class designed to be extended
-with an underlying implementation of the [`stream._read(size)`][stream-_read]
-and [`stream._write(chunk, encoding, callback)`][stream-_write] methods as you
-would with a Readable or Writable stream class.
-
-Since JavaScript doesn't have multiple prototypal inheritance, this class
-prototypally inherits from Readable, and then parasitically from Writable. It is
-thus up to the user to implement both the low-level
-[`stream._read(n)`][stream-_read] method as well as the low-level
-[`stream._write(chunk, encoding, callback)`][stream-_write] method on extension
-duplex classes.
-
-#### new stream.Duplex(options)
-
-* `options` {Object} Passed to both Writable and Readable
-  constructors. Also has the following fields:
-  * `allowHalfOpen` {Boolean} Default = `true`. If set to `false`, then
-    the stream will automatically end the readable side when the
-    writable side ends and vice versa.
-  * `readableObjectMode` {Boolean} Default = `false`. Sets `objectMode`
-    for readable side of the stream. Has no effect if `objectMode`
-    is `true`.
-  * `writableObjectMode` {Boolean} Default = `false`. Sets `objectMode`
-    for writable side of the stream. Has no effect if `objectMode`
-    is `true`.
-
-In classes that extend the Duplex class, make sure to call the
-constructor so that the buffering settings can be properly
-initialized.
-
-### Class: stream.PassThrough
-
-This is a trivial implementation of a [Transform][] stream that simply
-passes the input bytes across to the output. Its purpose is mainly
-for examples and testing, but there are occasionally use cases where
-it can come in handy as a building block for novel sorts of streams.
-
-### Class: stream.Readable
-
-<!--type=class-->
-
-`stream.Readable` is an abstract class designed to be extended with an
-underlying implementation of the [`stream._read(size)`][stream-_read] method.
-
-Please see [API for Stream Consumers][] for how to consume
-streams in your programs. What follows is an explanation of how to
-implement Readable streams in your programs.
-
-#### new stream.Readable([options])
-
-* `options` {Object}
-  * `highWaterMark` {Number} The maximum number of bytes to store in
-    the internal buffer before ceasing to read from the underlying
-    resource. Default = `16384` (16kb), or `16` for `objectMode` streams
-  * `encoding` {String} If specified, then buffers will be decoded to
-    strings using the specified encoding. Default = `null`
-  * `objectMode` {Boolean} Whether this stream should behave
-    as a stream of objects. Meaning that [`stream.read(n)`][stream-read] returns
-    a single value instead of a Buffer of size n. Default = `false`
-  * `read` {Function} Implementation for the [`stream._read()`][stream-_read]
-    method.
-
-In classes that extend the Readable class, make sure to call the
-Readable constructor so that the buffering settings can be properly
-initialized.
-
-#### readable.\_read(size)
-
-* `size` {Number} Number of bytes to read asynchronously
-
-Note: **Implement this method, but do NOT call it directly.**
-
-This method is prefixed with an underscore because it is internal to the
-class that defines it and should only be called by the internal Readable
-class methods. All Readable stream implementations must provide a \_read
-method to fetch data from the underlying resource.
-
-When `_read()` is called, if data is available from the resource, the `_read()`
-implementation should start pushing that data into the read queue by calling
-[`this.push(dataChunk)`][stream-push]. `_read()` should continue reading from
-the resource and pushing data until push returns `false`, at which point it
-should stop reading from the resource. Only when `_read()` is called again after
-it has stopped should it start reading more data from the resource and pushing
-that data onto the queue.
-
-Note: once the `_read()` method is called, it will not be called again until
-the [`stream.push()`][stream-push] method is called.
-
-The `size` argument is advisory. Implementations where a "read" is a
-single call that returns data can use this to know how much data to
-fetch. Implementations where that is not relevant, such as TCP or
-TLS, may ignore this argument, and simply provide data whenever it
-becomes available. There is no need, for example to "wait" until
-`size` bytes are available before calling [`stream.push(chunk)`][stream-push].
-
-#### readable.push(chunk[, encoding])
-
-
-* `chunk` {Buffer|Null|String} Chunk of data to push into the read queue
-* `encoding` {String} Encoding of String chunks.  Must be a valid
-  Buffer encoding, such as `'utf8'` or `'ascii'`
-* return {Boolean} Whether or not more pushes should be performed
-
-Note: **This method should be called by Readable implementors, NOT
-by consumers of Readable streams.**
-
-If a value other than null is passed, The `push()` method adds a chunk of data
-into the queue for subsequent stream processors to consume. If `null` is
-passed, it signals the end of the stream (EOF), after which no more data
-can be written.
-
-The data added with `push()` can be pulled out by calling the
-[`stream.read()`][stream-read] method when the [`'readable'`][] event fires.
-
-This API is designed to be as flexible as possible. For example,
-you may be wrapping a lower-level source which has some sort of
-pause/resume mechanism, and a data callback. In those cases, you
-could wrap the low-level source object by doing something like this:
-
-```js
-// source is an object with readStop() and readStart() methods,
-// and an `ondata` member that gets called when it has data, and
-// an `onend` member that gets called when the data is over.
-
-util.inherits(SourceWrapper, Readable);
-
-function SourceWrapper(options) {
-  Readable.call(this, options);
-
-  this._source = getLowlevelSourceObject();
-
-  // Every time there's data, we push it into the internal buffer.
-  this._source.ondata = (chunk) => {
-    // if push() returns false, then we need to stop reading from source
-    if (!this.push(chunk))
-      this._source.readStop();
-  };
-
-  // When the source ends, we push the EOF-signaling `null` chunk
-  this._source.onend = () => {
-    this.push(null);
-  };
-}
-
-// _read will be called when the stream wants to pull more data in
-// the advisory size argument is ignored in this case.
-SourceWrapper.prototype._read = function(size) {
-  this._source.readStart();
-};
-```
-
-#### Example: A Counting Stream
-
-<!--type=example-->
-
-This is a basic example of a Readable stream. It emits the numerals
-from 1 to 1,000,000 in ascending order, and then ends.
-
-```js
-const Readable = require('stream').Readable;
-const util = require('util');
-util.inherits(Counter, Readable);
-
-function Counter(opt) {
-  Readable.call(this, opt);
-  this._max = 1000000;
-  this._index = 1;
-}
-
-Counter.prototype._read = function() {
-  var i = this._index++;
-  if (i > this._max)
-    this.push(null);
-  else {
-    var str = '' + i;
-    var buf = new Buffer(str, 'ascii');
-    this.push(buf);
-  }
-};
-```
-
-#### Example: SimpleProtocol v1 (Sub-optimal)
-
-This is similar to the `parseHeader` function described
-[here](#stream_readable_unshift_chunk), but implemented as a custom stream.
-Also, note that this implementation does not convert the incoming data to a
-string.
-
-However, this would be better implemented as a [Transform][] stream. See
-[SimpleProtocol v2][] for a better implementation.
-
-```js
-// A parser for a simple data protocol.
-// The "header" is a JSON object, followed by 2 \n characters, and
-// then a message body.
-//
-// NOTE: This can be done more simply as a Transform stream!
-// Using Readable directly for this is sub-optimal. See the
-// alternative example below under the Transform section.
-
-const Readable = require('stream').Readable;
-const util = require('util');
-
-util.inherits(SimpleProtocol, Readable);
-
-function SimpleProtocol(source, options) {
-  if (!(this instanceof SimpleProtocol))
-    return new SimpleProtocol(source, options);
-
-  Readable.call(this, options);
-  this._inBody = false;
-  this._sawFirstCr = false;
-
-  // source is a readable stream, such as a socket or file
-  this._source = source;
-
-  var self = this;
-  source.on('end', () => {
-    self.push(null);
-  });
-
-  // give it a kick whenever the source is readable
-  // read(0) will not consume any bytes
-  source.on('readable', () => {
-    self.read(0);
-  });
-
-  this._rawHeader = [];
-  this.header = null;
-}
-
-SimpleProtocol.prototype._read = function(n) {
-  if (!this._inBody) {
-    var chunk = this._source.read();
-
-    // if the source doesn't have data, we don't have data yet.
-    if (chunk === null)
-      return this.push('');
-
-    // check if the chunk has a \n\n
-    var split = -1;
-    for (var i = 0; i < chunk.length; i++) {
-      if (chunk[i] === 10) { // '\n'
-        if (this._sawFirstCr) {
-          split = i;
-          break;
-        } else {
-          this._sawFirstCr = true;
-        }
-      } else {
-        this._sawFirstCr = false;
-      }
-    }
-
-    if (split === -1) {
-      // still waiting for the \n\n
-      // stash the chunk, and try again.
-      this._rawHeader.push(chunk);
-      this.push('');
-    } else {
-      this._inBody = true;
-      var h = chunk.slice(0, split);
-      this._rawHeader.push(h);
-      var header = Buffer.concat(this._rawHeader).toString();
-      try {
-        this.header = JSON.parse(header);
-      } catch (er) {
-        this.emit('error', new Error('invalid simple protocol data'));
-        return;
-      }
-      // now, because we got some extra data, unshift the rest
-      // back into the read queue so that our consumer will see it.
-      var b = chunk.slice(split);
-      this.unshift(b);
-      // calling unshift by itself does not reset the reading state
-      // of the stream; since we're inside _read, doing an additional
-      // push('') will reset the state appropriately.
-      this.push('');
-
-      // and let them know that we are done parsing the header.
-      this.emit('header', this.header);
-    }
-  } else {
-    // from there on, just provide the data to our consumer.
-    // careful not to push(null), since that would indicate EOF.
-    var chunk = this._source.read();
-    if (chunk) this.push(chunk);
-  }
-};
-
-// Usage:
-// var parser = new SimpleProtocol(source);
-// Now parser is a readable stream that will emit 'header'
-// with the parsed header data.
-```
-
-### Class: stream.Transform
-
-A "transform" stream is a duplex stream where the output is causally
-connected in some way to the input, such as a [zlib][] stream or a
-[crypto][] stream.
-
-There is no requirement that the output be the same size as the input,
-the same number of chunks, or arrive at the same time. For example, a
-Hash stream will only ever have a single chunk of output which is
-provided when the input is ended. A zlib stream will produce output
-that is either much smaller or much larger than its input.
-
-Rather than implement the [`stream._read()`][stream-_read] and
-[`stream._write()`][stream-_write] methods, Transform classes must implement the
-[`stream._transform()`][stream-_transform] method, and may optionally
-also implement the [`stream._flush()`][stream-_flush] method. (See below.)
-
-#### new stream.Transform([options])
-
-* `options` {Object} Passed to both Writable and Readable
-  constructors. Also has the following fields:
-  * `transform` {Function} Implementation for the
-    [`stream._transform()`][stream-_transform] method.
-  * `flush` {Function} Implementation for the [`stream._flush()`][stream-_flush]
-    method.
-
-In classes that extend the Transform class, make sure to call the
-constructor so that the buffering settings can be properly
-initialized.
-
-#### Events: 'finish' and 'end'
-
-The [`'finish'`][] and [`'end'`][] events are from the parent Writable
-and Readable classes respectively. The `'finish'` event is fired after
-[`stream.end()`][stream-end] is called and all chunks have been processed by
-[`stream._transform()`][stream-_transform], `'end'` is fired after all data has
-been output which is after the callback in [`stream._flush()`][stream-_flush]
-has been called.
-
-#### transform.\_flush(callback)
-
-* `callback` {Function} Call this function (optionally with an error
-  argument) when you are done flushing any remaining data.
-
-Note: **This function MUST NOT be called directly.**  It MAY be implemented
-by child classes, and if so, will be called by the internal Transform
-class methods only.
-
-In some cases, your transform operation may need to emit a bit more
-data at the end of the stream. For example, a `Zlib` compression
-stream will store up some internal state so that it can optimally
-compress the output. At the end, however, it needs to do the best it
-can with what is left, so that the data will be complete.
-
-In those cases, you can implement a `_flush()` method, which will be
-called at the very end, after all the written data is consumed, but
-before emitting [`'end'`][] to signal the end of the readable side. Just
-like with [`stream._transform()`][stream-_transform], call
-`transform.push(chunk)` zero or more times, as appropriate, and call `callback`
-when the flush operation is complete.
-
-This method is prefixed with an underscore because it is internal to
-the class that defines it, and should not be called directly by user
-programs. However, you **are** expected to override this method in
-your own extension classes.
-
-#### transform.\_transform(chunk, encoding, callback)
-
-* `chunk` {Buffer|String} The chunk to be transformed. Will **always**
-  be a buffer unless the `decodeStrings` option was set to `false`.
-* `encoding` {String} If the chunk is a string, then this is the
-  encoding type. If chunk is a buffer, then this is the special
-  value - 'buffer', ignore it in this case.
-* `callback` {Function} Call this function (optionally with an error
-  argument and data) when you are done processing the supplied chunk.
-
-Note: **This function MUST NOT be called directly.**  It should be
-implemented by child classes, and called by the internal Transform
-class methods only.
-
-All Transform stream implementations must provide a `_transform()`
-method to accept input and produce output.
-
-`_transform()` should do whatever has to be done in this specific
-Transform class, to handle the bytes being written, and pass them off
-to the readable portion of the interface. Do asynchronous I/O,
-process things, and so on.
-
-Call `transform.push(outputChunk)` 0 or more times to generate output
-from this input chunk, depending on how much data you want to output
-as a result of this chunk.
-
-Call the callback function only when the current chunk is completely
-consumed. Note that there may or may not be output as a result of any
-particular input chunk. If you supply a second argument to the callback
-it will be passed to the push method. In other words the following are
-equivalent:
-
-```js
-transform.prototype._transform = function (data, encoding, callback) {
-  this.push(data);
-  callback();
-};
-
-transform.prototype._transform = function (data, encoding, callback) {
-  callback(null, data);
-};
-```
-
-This method is prefixed with an underscore because it is internal to
-the class that defines it, and should not be called directly by user
-programs. However, you **are** expected to override this method in
-your own extension classes.
-
-#### Example: `SimpleProtocol` parser v2
-
-The example [here](#stream_example_simpleprotocol_v1_sub_optimal) of a simple
-protocol parser can be implemented simply by using the higher level
-[Transform][] stream class, similar to the `parseHeader` and `SimpleProtocol
-v1` examples.
-
-In this example, rather than providing the input as an argument, it
-would be piped into the parser, which is a more idiomatic Node.js stream
-approach.
-
-```javascript
-const util = require('util');
-const Transform = require('stream').Transform;
-util.inherits(SimpleProtocol, Transform);
-
-function SimpleProtocol(options) {
-  if (!(this instanceof SimpleProtocol))
-    return new SimpleProtocol(options);
-
-  Transform.call(this, options);
-  this._inBody = false;
-  this._sawFirstCr = false;
-  this._rawHeader = [];
-  this.header = null;
-}
-
-SimpleProtocol.prototype._transform = function(chunk, encoding, done) {
-  if (!this._inBody) {
-    // check if the chunk has a \n\n
-    var split = -1;
-    for (var i = 0; i < chunk.length; i++) {
-      if (chunk[i] === 10) { // '\n'
-        if (this._sawFirstCr) {
-          split = i;
-          break;
-        } else {
-          this._sawFirstCr = true;
-        }
-      } else {
-        this._sawFirstCr = false;
-      }
-    }
-
-    if (split === -1) {
-      // still waiting for the \n\n
-      // stash the chunk, and try again.
-      this._rawHeader.push(chunk);
-    } else {
-      this._inBody = true;
-      var h = chunk.slice(0, split);
-      this._rawHeader.push(h);
-      var header = Buffer.concat(this._rawHeader).toString();
-      try {
-        this.header = JSON.parse(header);
-      } catch (er) {
-        this.emit('error', new Error('invalid simple protocol data'));
-        return;
-      }
-      // and let them know that we are done parsing the header.
-      this.emit('header', this.header);
-
-      // now, because we got some extra data, emit this first.
-      this.push(chunk.slice(split));
-    }
-  } else {
-    // from there on, just provide the data to our consumer as-is.
-    this.push(chunk);
-  }
-  done();
-};
-
-// Usage:
-// var parser = new SimpleProtocol();
-// source.pipe(parser)
-// Now parser is a readable stream that will emit 'header'
-// with the parsed header data.
-```
-
-### Class: stream.Writable
-
-<!--type=class-->
-
-`stream.Writable` is an abstract class designed to be extended with an
-underlying implementation of the
-[`stream._write(chunk, encoding, callback)`][stream-_write] method.
-
-Please see [API for Stream Consumers][] for how to consume
-writable streams in your programs. What follows is an explanation of
-how to implement Writable streams in your programs.
-
-#### new stream.Writable([options])
-
-* `options` {Object}
-  * `highWaterMark` {Number} Buffer level when
-    [`stream.write()`][stream-write] starts returning `false`. Default = `16384`
-    (16kb), or `16` for `objectMode` streams.
-  * `decodeStrings` {Boolean} Whether or not to decode strings into
-    Buffers before passing them to [`stream._write()`][stream-_write].
-    Default = `true`
-  * `objectMode` {Boolean} Whether or not the
-    [`stream.write(anyObj)`][stream-write] is a valid operation. If set you can
-    write arbitrary data instead of only `Buffer` / `String` data.
-    Default = `false`
-  * `write` {Function} Implementation for the
-    [`stream._write()`][stream-_write] method.
-  * `writev` {Function} Implementation for the
-    [`stream._writev()`][stream-_writev] method.
-
-In classes that extend the Writable class, make sure to call the
-constructor so that the buffering settings can be properly
-initialized.
-
-#### writable.\_write(chunk, encoding, callback)
-
-* `chunk` {Buffer|String} The chunk to be written. Will **always**
-  be a buffer unless the `decodeStrings` option was set to `false`.
-* `encoding` {String} If the chunk is a string, then this is the
-  encoding type. If chunk is a buffer, then this is the special
-  value - 'buffer', ignore it in this case.
-* `callback` {Function} Call this function (optionally with an error
-  argument) when you are done processing the supplied chunk.
-
-All Writable stream implementations must provide a
-[`stream._write()`][stream-_write] method to send data to the underlying
-resource.
-
-Note: **This function MUST NOT be called directly.**  It should be
-implemented by child classes, and called by the internal Writable
-class methods only.
-
-Call the callback using the standard `callback(error)` pattern to
-signal that the write completed successfully or with an error.
-
-If the `decodeStrings` flag is set in the constructor options, then
-`chunk` may be a string rather than a Buffer, and `encoding` will
-indicate the sort of string that it is. This is to support
-implementations that have an optimized handling for certain string
-data encodings. If you do not explicitly set the `decodeStrings`
-option to `false`, then you can safely ignore the `encoding` argument,
-and assume that `chunk` will always be a Buffer.
-
-This method is prefixed with an underscore because it is internal to
-the class that defines it, and should not be called directly by user
-programs. However, you **are** expected to override this method in
-your own extension classes.
-
-#### writable.\_writev(chunks, callback)
-
-* `chunks` {Array} The chunks to be written. Each chunk has following
-  format: `{ chunk: ..., encoding: ... }`.
-* `callback` {Function} Call this function (optionally with an error
-  argument) when you are done processing the supplied chunks.
-
-Note: **This function MUST NOT be called directly.**  It may be
-implemented by child classes, and called by the internal Writable
-class methods only.
-
-This function is completely optional to implement. In most cases it is
-unnecessary. If implemented, it will be called with all the chunks
-that are buffered in the write queue.
-
-
-## Simplified Constructor API
-
-<!--type=misc-->
-
-In simple cases there is now the added benefit of being able to construct a
-stream without inheritance.
-
-This can be done by passing the appropriate methods as constructor options:
-
-Examples:
-
-### Duplex
-
-```js
-var duplex = new stream.Duplex({
-  read: function(n) {
-    // sets this._read under the hood
-
-    // push data onto the read queue, passing null
-    // will signal the end of the stream (EOF)
-    this.push(chunk);
-  },
-  write: function(chunk, encoding, next) {
-    // sets this._write under the hood
-
-    // An optional error can be passed as the first argument
-    next()
-  }
-});
-
-// or
-
-var duplex = new stream.Duplex({
-  read: function(n) {
-    // sets this._read under the hood
-
-    // push data onto the read queue, passing null
-    // will signal the end of the stream (EOF)
-    this.push(chunk);
-  },
-  writev: function(chunks, next) {
-    // sets this._writev under the hood
-
-    // An optional error can be passed as the first argument
-    next()
-  }
-});
-```
-
-### Readable
-
-```js
-var readable = new stream.Readable({
-  read: function(n) {
-    // sets this._read under the hood
-
-    // push data onto the read queue, passing null
-    // will signal the end of the stream (EOF)
-    this.push(chunk);
-  }
-});
-```
-
-### Transform
-
-```js
-var transform = new stream.Transform({
-  transform: function(chunk, encoding, next) {
-    // sets this._transform under the hood
-
-    // generate output as many times as needed
-    // this.push(chunk);
-
-    // call when the current chunk is consumed
-    next();
-  },
-  flush: function(done) {
-    // sets this._flush under the hood
-
-    // generate output as many times as needed
-    // this.push(chunk);
-
-    done();
-  }
-});
-```
-
-### Writable
-
-```js
-var writable = new stream.Writable({
-  write: function(chunk, encoding, next) {
-    // sets this._write under the hood
-
-    // An optional error can be passed as the first argument
-    next()
-  }
-});
-
-// or
-
-var writable = new stream.Writable({
-  writev: function(chunks, next) {
-    // sets this._writev under the hood
-
-    // An optional error can be passed as the first argument
-    next()
-  }
-});
-```
-
-## Streams: Under the Hood
-
-<!--type=misc-->
-
-### Buffering
-
-<!--type=misc-->
-
-Both Writable and Readable streams will buffer data on an internal
-object which can be retrieved from `_writableState.getBuffer()` or
-`_readableState.buffer`, respectively.
-
-The amount of data that will potentially be buffered depends on the
-`highWaterMark` option which is passed into the constructor.
-
-Buffering in Readable streams happens when the implementation calls
-[`stream.push(chunk)`][stream-push]. If the consumer of the Stream does not
-call [`stream.read()`][stream-read], then the data will sit in the internal
-queue until it is consumed.
-
-Buffering in Writable streams happens when the user calls
-[`stream.write(chunk)`][stream-write] repeatedly, even when it returns `false`.
-
-The purpose of streams, especially with the [`stream.pipe()`][] method, is to
-limit the buffering of data to acceptable levels, so that sources and
-destinations of varying speed will not overwhelm the available memory.
-
-### Compatibility with Older Node.js Versions
-
-<!--type=misc-->
-
-In versions of Node.js prior to v0.10, the Readable stream interface was
-simpler, but also less powerful and less useful.
-
-* Rather than waiting for you to call the [`stream.read()`][stream-read] method,
-  [`'data'`][] events would start emitting immediately. If you needed to do
-  some I/O to decide how to handle data, then you had to store the chunks
-  in some kind of buffer so that they would not be lost.
-* The [`stream.pause()`][stream-pause] method was advisory, rather than
-  guaranteed. This meant that you still had to be prepared to receive
-  [`'data'`][] events even when the stream was in a paused state.
-
-In Node.js v0.10, the [Readable][] class was added.
-For backwards compatibility with older Node.js programs, Readable streams
-switch into "flowing mode" when a [`'data'`][] event handler is added, or
-when the [`stream.resume()`][stream-resume] method is called. The effect is
-that, even if you are not using the new [`stream.read()`][stream-read] method
-and [`'readable'`][] event, you no longer have to worry about losing
-[`'data'`][] chunks.
-
-Most programs will continue to function normally. However, this
-introduces an edge case in the following conditions:
-
-* No [`'data'`][] event handler is added.
-* The [`stream.resume()`][stream-resume] method is never called.
-* The stream is not piped to any writable destination.
-
-For example, consider the following code:
-
-```js
-// WARNING!  BROKEN!
-net.createServer((socket) => {
-
-  // we add an 'end' method, but never consume the data
-  socket.on('end', () => {
-    // It will never get here.
-    socket.end('I got your message (but didnt read it)\n');
-  });
-
-}).listen(1337);
-```
-
-In versions of Node.js prior to v0.10, the incoming message data would be
-simply discarded. However, in Node.js v0.10 and beyond,
-the socket will remain paused forever.
-
-The workaround in this situation is to call the
-[`stream.resume()`][stream-resume] method to start the flow of data:
-
-```js
-// Workaround
-net.createServer((socket) => {
-
-  socket.on('end', () => {
-    socket.end('I got your message (but didnt read it)\n');
-  });
-
-  // start the flow of data, discarding it.
-  socket.resume();
-
-}).listen(1337);
-```
-
-In addition to new Readable streams switching into flowing mode,
-pre-v0.10 style streams can be wrapped in a Readable class using the
-[`stream.wrap()`][] method.
-
-
-### Object Mode
-
-<!--type=misc-->
-
-Normally, Streams operate on Strings and Buffers exclusively.
-
-Streams that are in **object mode** can emit generic JavaScript values
-other than Buffers and Strings.
-
-A Readable stream in object mode will always return a single item from
-a call to [`stream.read(size)`][stream-read], regardless of what the size
-argument is.
-
-A Writable stream in object mode will always ignore the `encoding`
-argument to [`stream.write(data, encoding)`][stream-write].
-
-The special value `null` still retains its special value for object
-mode streams. That is, for object mode readable streams, `null` as a
-return value from [`stream.read()`][stream-read] indicates that there is no more
-data, and [`stream.push(null)`][stream-push] will signal the end of stream data
-(`EOF`).
-
-No streams in Node.js core are object mode streams. This pattern is only
-used by userland streaming libraries.
-
-You should set `objectMode` in your stream child class constructor on
-the options object. Setting `objectMode` mid-stream is not safe.
-
-For Duplex streams `objectMode` can be set exclusively for readable or
-writable side with `readableObjectMode` and `writableObjectMode`
-respectively. These options can be used to implement parsers and
-serializers with Transform streams.
-
-```js
-const util = require('util');
-const StringDecoder = require('string_decoder').StringDecoder;
-const Transform = require('stream').Transform;
-util.inherits(JSONParseStream, Transform);
-
-// Gets \n-delimited JSON string data, and emits the parsed objects
-function JSONParseStream() {
-  if (!(this instanceof JSONParseStream))
-    return new JSONParseStream();
-
-  Transform.call(this, { readableObjectMode : true });
-
-  this._buffer = '';
-  this._decoder = new StringDecoder('utf8');
-}
-
-JSONParseStream.prototype._transform = function(chunk, encoding, cb) {
-  this._buffer += this._decoder.write(chunk);
-  // split on newlines
-  var lines = this._buffer.split(/\r?\n/);
-  // keep the last partial line buffered
-  this._buffer = lines.pop();
-  for (var l = 0; l < lines.length; l++) {
-    var line = lines[l];
-    try {
-      var obj = JSON.parse(line);
-    } catch (er) {
-      this.emit('error', er);
-      return;
-    }
-    // push the parsed object out to the readable consumer
-    this.push(obj);
-  }
-  cb();
-};
-
-JSONParseStream.prototype._flush = function(cb) {
-  // Just handle any leftover
-  var rem = this._buffer.trim();
-  if (rem) {
-    try {
-      var obj = JSON.parse(rem);
-    } catch (er) {
-      this.emit('error', er);
-      return;
-    }
-    // push the parsed object out to the readable consumer
-    this.push(obj);
-  }
-  cb();
-};
-```
-
-### `stream.read(0)`
-
-There are some cases where you want to trigger a refresh of the
-underlying readable stream mechanisms, without actually consuming any
-data. In that case, you can call `stream.read(0)`, which will always
-return null.
-
-If the internal read buffer is below the `highWaterMark`, and the
-stream is not currently reading, then calling `stream.read(0)` will trigger
-a low-level [`stream._read()`][stream-_read] call.
-
-There is almost never a need to do this. However, you will see some
-cases in Node.js's internals where this is done, particularly in the
-Readable stream class internals.
-
-### `stream.push('')`
-
-Pushing a zero-byte string or Buffer (when not in [Object mode][]) has an
-interesting side effect. Because it *is* a call to
-[`stream.push()`][stream-push], it will end the `reading` process. However, it
-does *not* add any data to the readable buffer, so there's nothing for
-a user to consume.
-
-Very rarely, there are cases where you have no data to provide now,
-but the consumer of your stream (or, perhaps, another bit of your own
-code) will know when to check again, by calling [`stream.read(0)`][stream-read].
-In those cases, you *may* call `stream.push('')`.
-
-So far, the only use case for this functionality is in the
-[`tls.CryptoStream`][] class, which is deprecated in Node.js/io.js v1.0. If you
-find that you have to use `stream.push('')`, please consider another
-approach, because it almost certainly indicates that something is
-horribly wrong.
-
-[`'data'`]: #stream_event_data
-[`'drain'`]: #stream_event_drain
-[`'end'`]: #stream_event_end
-[`'finish'`]: #stream_event_finish
-[`'readable'`]: #stream_event_readable
-[`buf.toString(encoding)`]: https://nodejs.org/docs/v5.8.0/api/buffer.html#buffer_buf_tostring_encoding_start_end
-[`EventEmitter`]: https://nodejs.org/docs/v5.8.0/api/events.html#events_class_eventemitter
-[`process.stderr`]: https://nodejs.org/docs/v5.8.0/api/process.html#process_process_stderr
-[`process.stdin`]: https://nodejs.org/docs/v5.8.0/api/process.html#process_process_stdin
-[`process.stdout`]: https://nodejs.org/docs/v5.8.0/api/process.html#process_process_stdout
-[`stream.cork()`]: #stream_writable_cork
-[`stream.pipe()`]: #stream_readable_pipe_destination_options
-[`stream.uncork()`]: #stream_writable_uncork
-[`stream.unpipe()`]: #stream_readable_unpipe_destination
-[`stream.wrap()`]: #stream_readable_wrap_stream
-[`tls.CryptoStream`]: https://nodejs.org/docs/v5.8.0/api/tls.html#tls_class_cryptostream
-[`util.inherits()`]: https://nodejs.org/docs/v5.8.0/api/util.html#util_util_inherits_constructor_superconstructor
-[API for Stream Consumers]: #stream_api_for_stream_consumers
-[API for Stream Implementors]: #stream_api_for_stream_implementors
-[child process stdin]: https://nodejs.org/docs/v5.8.0/api/child_process.html#child_process_child_stdin
-[child process stdout and stderr]: https://nodejs.org/docs/v5.8.0/api/child_process.html#child_process_child_stdout
-[Compatibility]: #stream_compatibility_with_older_node_js_versions
-[crypto]: crypto.html
-[Duplex]: #stream_class_stream_duplex
-[fs read streams]: https://nodejs.org/docs/v5.8.0/api/fs.html#fs_class_fs_readstream
-[fs write streams]: https://nodejs.org/docs/v5.8.0/api/fs.html#fs_class_fs_writestream
-[HTTP requests, on the client]: https://nodejs.org/docs/v5.8.0/api/http.html#http_class_http_clientrequest
-[HTTP responses, on the server]: https://nodejs.org/docs/v5.8.0/api/http.html#http_class_http_serverresponse
-[http-incoming-message]: https://nodejs.org/docs/v5.8.0/api/http.html#http_class_http_incomingmessage
-[Object mode]: #stream_object_mode
-[Readable]: #stream_class_stream_readable
-[SimpleProtocol v2]: #stream_example_simpleprotocol_parser_v2
-[stream-_flush]: #stream_transform_flush_callback
-[stream-_read]: #stream_readable_read_size_1
-[stream-_transform]: #stream_transform_transform_chunk_encoding_callback
-[stream-_write]: #stream_writable_write_chunk_encoding_callback_1
-[stream-_writev]: #stream_writable_writev_chunks_callback
-[stream-end]: #stream_writable_end_chunk_encoding_callback
-[stream-pause]: #stream_readable_pause
-[stream-push]: #stream_readable_push_chunk_encoding
-[stream-read]: #stream_readable_read_size
-[stream-resume]: #stream_readable_resume
-[stream-write]: #stream_writable_write_chunk_encoding_callback
-[TCP sockets]: https://nodejs.org/docs/v5.8.0/api/net.html#net_class_net_socket
-[Transform]: #stream_class_stream_transform
-[Writable]: #stream_class_stream_writable
-[zlib]: zlib.html
diff --git a/node_modules/concat-stream/node_modules/readable-stream/doc/wg-meetings/2015-01-30.md b/node_modules/concat-stream/node_modules/readable-stream/doc/wg-meetings/2015-01-30.md
deleted file mode 100644
index 83275f192..000000000
--- a/node_modules/concat-stream/node_modules/readable-stream/doc/wg-meetings/2015-01-30.md
+++ /dev/null
@@ -1,60 +0,0 @@
-# streams WG Meeting 2015-01-30
-
-## Links
-
-* **Google Hangouts Video**: http://www.youtube.com/watch?v=I9nDOSGfwZg
-* **GitHub Issue**: https://github.com/iojs/readable-stream/issues/106
-* **Original Minutes Google Doc**: https://docs.google.com/document/d/17aTgLnjMXIrfjgNaTUnHQO7m3xgzHR2VXBTmi03Qii4/
-
-## Agenda
-
-Extracted from https://github.com/iojs/readable-stream/labels/wg-agenda prior to meeting.
-
-* adopt a charter [#105](https://github.com/iojs/readable-stream/issues/105)
-* release and versioning strategy [#101](https://github.com/iojs/readable-stream/issues/101)
-* simpler stream creation [#102](https://github.com/iojs/readable-stream/issues/102)
-* proposal: deprecate implicit flowing of streams [#99](https://github.com/iojs/readable-stream/issues/99)
-
-## Minutes
-
-### adopt a charter
-
-* group: +1's all around
-
-### What versioning scheme should be adopted?
-* group: +1’s 3.0.0
-* domenic+group: pulling in patches from other sources where appropriate
-* mikeal: version independently, suggesting versions for io.js
-* mikeal+domenic: work with TC to notify in advance of changes
-simpler stream creation
-
-### streamline creation of streams
-* sam: streamline creation of streams
-* domenic: nice simple solution posted
-  but, we lose the opportunity to change the model
-  may not be backwards incompatible (double check keys)
-
-  **action item:** domenic will check
-
-### remove implicit flowing of streams on(‘data’)
-* add isFlowing / isPaused
-* mikeal: worrying that we’re documenting polyfill methods – confuses users
-* domenic: more reflective API is probably good, with warning labels for users
-* new section for mad scientists (reflective stream access)
-* calvin: name the “third state”
-* mikeal: maybe borrow the name from whatwg?
-* domenic: we’re missing the “third state”
-* consensus: kind of difficult to name the third state
-* mikeal: figure out differences in states / compat
-* mathias: always flow on data – eliminates third state
-  * explore what it breaks
-
-**action items:**
-* ask isaac for ability to list packages by what public io.js APIs they use (esp. Stream)
-* ask rod/build for infrastructure
-* **chris**: explore the “flow on data” approach
-* add isPaused/isFlowing
-* add new docs section
-* move isPaused to that section
-
-
diff --git a/node_modules/concat-stream/node_modules/readable-stream/duplex.js b/node_modules/concat-stream/node_modules/readable-stream/duplex.js
deleted file mode 100644
index ca807af87..000000000
--- a/node_modules/concat-stream/node_modules/readable-stream/duplex.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = require("./lib/_stream_duplex.js")
diff --git a/node_modules/concat-stream/node_modules/readable-stream/lib/_stream_duplex.js b/node_modules/concat-stream/node_modules/readable-stream/lib/_stream_duplex.js
deleted file mode 100644
index 736693b84..000000000
--- a/node_modules/concat-stream/node_modules/readable-stream/lib/_stream_duplex.js
+++ /dev/null
@@ -1,75 +0,0 @@
-// a duplex stream is just a stream that is both readable and writable.
-// Since JS doesn't have multiple prototypal inheritance, this class
-// prototypally inherits from Readable, and then parasitically from
-// Writable.
-
-'use strict';
-
-/*<replacement>*/
-
-var objectKeys = Object.keys || function (obj) {
-  var keys = [];
-  for (var key in obj) {
-    keys.push(key);
-  }return keys;
-};
-/*</replacement>*/
-
-module.exports = Duplex;
-
-/*<replacement>*/
-var processNextTick = require('process-nextick-args');
-/*</replacement>*/
-
-/*<replacement>*/
-var util = require('core-util-is');
-util.inherits = require('inherits');
-/*</replacement>*/
-
-var Readable = require('./_stream_readable');
-var Writable = require('./_stream_writable');
-
-util.inherits(Duplex, Readable);
-
-var keys = objectKeys(Writable.prototype);
-for (var v = 0; v < keys.length; v++) {
-  var method = keys[v];
-  if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];
-}
-
-function Duplex(options) {
-  if (!(this instanceof Duplex)) return new Duplex(options);
-
-  Readable.call(this, options);
-  Writable.call(this, options);
-
-  if (options && options.readable === false) this.readable = false;
-
-  if (options && options.writable === false) this.writable = false;
-
-  this.allowHalfOpen = true;
-  if (options && options.allowHalfOpen === false) this.allowHalfOpen = false;
-
-  this.once('end', onend);
-}
-
-// the no-half-open enforcer
-function onend() {
-  // if we allow half-open state, or if the writable side ended,
-  // then we're ok.
-  if (this.allowHalfOpen || this._writableState.ended) return;
-
-  // no more data can be written.
-  // But allow more writes to happen in this tick.
-  processNextTick(onEndNT, this);
-}
-
-function onEndNT(self) {
-  self.end();
-}
-
-function forEach(xs, f) {
-  for (var i = 0, l = xs.length; i < l; i++) {
-    f(xs[i], i);
-  }
-}
\ No newline at end of file
diff --git a/node_modules/concat-stream/node_modules/readable-stream/lib/_stream_passthrough.js b/node_modules/concat-stream/node_modules/readable-stream/lib/_stream_passthrough.js
deleted file mode 100644
index d06f71f18..000000000
--- a/node_modules/concat-stream/node_modules/readable-stream/lib/_stream_passthrough.js
+++ /dev/null
@@ -1,26 +0,0 @@
-// a passthrough stream.
-// basically just the most minimal sort of Transform stream.
-// Every written chunk gets output as-is.
-
-'use strict';
-
-module.exports = PassThrough;
-
-var Transform = require('./_stream_transform');
-
-/*<replacement>*/
-var util = require('core-util-is');
-util.inherits = require('inherits');
-/*</replacement>*/
-
-util.inherits(PassThrough, Transform);
-
-function PassThrough(options) {
-  if (!(this instanceof PassThrough)) return new PassThrough(options);
-
-  Transform.call(this, options);
-}
-
-PassThrough.prototype._transform = function (chunk, encoding, cb) {
-  cb(null, chunk);
-};
\ No newline at end of file
diff --git a/node_modules/concat-stream/node_modules/readable-stream/lib/_stream_readable.js b/node_modules/concat-stream/node_modules/readable-stream/lib/_stream_readable.js
deleted file mode 100644
index 54a9d5c55..000000000
--- a/node_modules/concat-stream/node_modules/readable-stream/lib/_stream_readable.js
+++ /dev/null
@@ -1,880 +0,0 @@
-'use strict';
-
-module.exports = Readable;
-
-/*<replacement>*/
-var processNextTick = require('process-nextick-args');
-/*</replacement>*/
-
-/*<replacement>*/
-var isArray = require('isarray');
-/*</replacement>*/
-
-/*<replacement>*/
-var Buffer = require('buffer').Buffer;
-/*</replacement>*/
-
-Readable.ReadableState = ReadableState;
-
-var EE = require('events');
-
-/*<replacement>*/
-var EElistenerCount = function (emitter, type) {
-  return emitter.listeners(type).length;
-};
-/*</replacement>*/
-
-/*<replacement>*/
-var Stream;
-(function () {
-  try {
-    Stream = require('st' + 'ream');
-  } catch (_) {} finally {
-    if (!Stream) Stream = require('events').EventEmitter;
-  }
-})();
-/*</replacement>*/
-
-var Buffer = require('buffer').Buffer;
-
-/*<replacement>*/
-var util = require('core-util-is');
-util.inherits = require('inherits');
-/*</replacement>*/
-
-/*<replacement>*/
-var debugUtil = require('util');
-var debug = undefined;
-if (debugUtil && debugUtil.debuglog) {
-  debug = debugUtil.debuglog('stream');
-} else {
-  debug = function () {};
-}
-/*</replacement>*/
-
-var StringDecoder;
-
-util.inherits(Readable, Stream);
-
-var Duplex;
-function ReadableState(options, stream) {
-  Duplex = Duplex || require('./_stream_duplex');
-
-  options = options || {};
-
-  // object stream flag. Used to make read(n) ignore n and to
-  // make all the buffer merging and length checks go away
-  this.objectMode = !!options.objectMode;
-
-  if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.readableObjectMode;
-
-  // the point at which it stops calling _read() to fill the buffer
-  // Note: 0 is a valid value, means "don't call _read preemptively ever"
-  var hwm = options.highWaterMark;
-  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
-  this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;
-
-  // cast to ints.
-  this.highWaterMark = ~ ~this.highWaterMark;
-
-  this.buffer = [];
-  this.length = 0;
-  this.pipes = null;
-  this.pipesCount = 0;
-  this.flowing = null;
-  this.ended = false;
-  this.endEmitted = false;
-  this.reading = false;
-
-  // a flag to be able to tell if the onwrite cb is called immediately,
-  // or on a later tick.  We set this to true at first, because any
-  // actions that shouldn't happen until "later" should generally also
-  // not happen before the first write call.
-  this.sync = true;
-
-  // whenever we return null, then we set a flag to say
-  // that we're awaiting a 'readable' event emission.
-  this.needReadable = false;
-  this.emittedReadable = false;
-  this.readableListening = false;
-  this.resumeScheduled = false;
-
-  // Crypto is kind of old and crusty.  Historically, its default string
-  // encoding is 'binary' so we have to make this configurable.
-  // Everything else in the universe uses 'utf8', though.
-  this.defaultEncoding = options.defaultEncoding || 'utf8';
-
-  // when piping, we only care about 'readable' events that happen
-  // after read()ing all the bytes and not getting any pushback.
-  this.ranOut = false;
-
-  // the number of writers that are awaiting a drain event in .pipe()s
-  this.awaitDrain = 0;
-
-  // if true, a maybeReadMore has been scheduled
-  this.readingMore = false;
-
-  this.decoder = null;
-  this.encoding = null;
-  if (options.encoding) {
-    if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
-    this.decoder = new StringDecoder(options.encoding);
-    this.encoding = options.encoding;
-  }
-}
-
-var Duplex;
-function Readable(options) {
-  Duplex = Duplex || require('./_stream_duplex');
-
-  if (!(this instanceof Readable)) return new Readable(options);
-
-  this._readableState = new ReadableState(options, this);
-
-  // legacy
-  this.readable = true;
-
-  if (options && typeof options.read === 'function') this._read = options.read;
-
-  Stream.call(this);
-}
-
-// Manually shove something into the read() buffer.
-// This returns true if the highWaterMark has not been hit yet,
-// similar to how Writable.write() returns true if you should
-// write() some more.
-Readable.prototype.push = function (chunk, encoding) {
-  var state = this._readableState;
-
-  if (!state.objectMode && typeof chunk === 'string') {
-    encoding = encoding || state.defaultEncoding;
-    if (encoding !== state.encoding) {
-      chunk = new Buffer(chunk, encoding);
-      encoding = '';
-    }
-  }
-
-  return readableAddChunk(this, state, chunk, encoding, false);
-};
-
-// Unshift should *always* be something directly out of read()
-Readable.prototype.unshift = function (chunk) {
-  var state = this._readableState;
-  return readableAddChunk(this, state, chunk, '', true);
-};
-
-Readable.prototype.isPaused = function () {
-  return this._readableState.flowing === false;
-};
-
-function readableAddChunk(stream, state, chunk, encoding, addToFront) {
-  var er = chunkInvalid(state, chunk);
-  if (er) {
-    stream.emit('error', er);
-  } else if (chunk === null) {
-    state.reading = false;
-    onEofChunk(stream, state);
-  } else if (state.objectMode || chunk && chunk.length > 0) {
-    if (state.ended && !addToFront) {
-      var e = new Error('stream.push() after EOF');
-      stream.emit('error', e);
-    } else if (state.endEmitted && addToFront) {
-      var e = new Error('stream.unshift() after end event');
-      stream.emit('error', e);
-    } else {
-      var skipAdd;
-      if (state.decoder && !addToFront && !encoding) {
-        chunk = state.decoder.write(chunk);
-        skipAdd = !state.objectMode && chunk.length === 0;
-      }
-
-      if (!addToFront) state.reading = false;
-
-      // Don't add to the buffer if we've decoded to an empty string chunk and
-      // we're not in object mode
-      if (!skipAdd) {
-        // if we want the data now, just emit it.
-        if (state.flowing && state.length === 0 && !state.sync) {
-          stream.emit('data', chunk);
-          stream.read(0);
-        } else {
-          // update the buffer info.
-          state.length += state.objectMode ? 1 : chunk.length;
-          if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);
-
-          if (state.needReadable) emitReadable(stream);
-        }
-      }
-
-      maybeReadMore(stream, state);
-    }
-  } else if (!addToFront) {
-    state.reading = false;
-  }
-
-  return needMoreData(state);
-}
-
-// if it's past the high water mark, we can push in some more.
-// Also, if we have no data yet, we can stand some
-// more bytes.  This is to work around cases where hwm=0,
-// such as the repl.  Also, if the push() triggered a
-// readable event, and the user called read(largeNumber) such that
-// needReadable was set, then we ought to push more, so that another
-// 'readable' event will be triggered.
-function needMoreData(state) {
-  return !state.ended && (state.needReadable || state.length < state.highWaterMark || state.length === 0);
-}
-
-// backwards compatibility.
-Readable.prototype.setEncoding = function (enc) {
-  if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
-  this._readableState.decoder = new StringDecoder(enc);
-  this._readableState.encoding = enc;
-  return this;
-};
-
-// Don't raise the hwm > 8MB
-var MAX_HWM = 0x800000;
-function computeNewHighWaterMark(n) {
-  if (n >= MAX_HWM) {
-    n = MAX_HWM;
-  } else {
-    // Get the next highest power of 2
-    n--;
-    n |= n >>> 1;
-    n |= n >>> 2;
-    n |= n >>> 4;
-    n |= n >>> 8;
-    n |= n >>> 16;
-    n++;
-  }
-  return n;
-}
-
-function howMuchToRead(n, state) {
-  if (state.length === 0 && state.ended) return 0;
-
-  if (state.objectMode) return n === 0 ? 0 : 1;
-
-  if (n === null || isNaN(n)) {
-    // only flow one buffer at a time
-    if (state.flowing && state.buffer.length) return state.buffer[0].length;else return state.length;
-  }
-
-  if (n <= 0) return 0;
-
-  // If we're asking for more than the target buffer level,
-  // then raise the water mark.  Bump up to the next highest
-  // power of 2, to prevent increasing it excessively in tiny
-  // amounts.
-  if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n);
-
-  // don't have that much.  return null, unless we've ended.
-  if (n > state.length) {
-    if (!state.ended) {
-      state.needReadable = true;
-      return 0;
-    } else {
-      return state.length;
-    }
-  }
-
-  return n;
-}
-
-// you can override either this method, or the async _read(n) below.
-Readable.prototype.read = function (n) {
-  debug('read', n);
-  var state = this._readableState;
-  var nOrig = n;
-
-  if (typeof n !== 'number' || n > 0) state.emittedReadable = false;
-
-  // if we're doing read(0) to trigger a readable event, but we
-  // already have a bunch of data in the buffer, then just trigger
-  // the 'readable' event and move on.
-  if (n === 0 && state.needReadable && (state.length >= state.highWaterMark || state.ended)) {
-    debug('read: emitReadable', state.length, state.ended);
-    if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this);
-    return null;
-  }
-
-  n = howMuchToRead(n, state);
-
-  // if we've ended, and we're now clear, then finish it up.
-  if (n === 0 && state.ended) {
-    if (state.length === 0) endReadable(this);
-    return null;
-  }
-
-  // All the actual chunk generation logic needs to be
-  // *below* the call to _read.  The reason is that in certain
-  // synthetic stream cases, such as passthrough streams, _read
-  // may be a completely synchronous operation which may change
-  // the state of the read buffer, providing enough data when
-  // before there was *not* enough.
-  //
-  // So, the steps are:
-  // 1. Figure out what the state of things will be after we do
-  // a read from the buffer.
-  //
-  // 2. If that resulting state will trigger a _read, then call _read.
-  // Note that this may be asynchronous, or synchronous.  Yes, it is
-  // deeply ugly to write APIs this way, but that still doesn't mean
-  // that the Readable class should behave improperly, as streams are
-  // designed to be sync/async agnostic.
-  // Take note if the _read call is sync or async (ie, if the read call
-  // has returned yet), so that we know whether or not it's safe to emit
-  // 'readable' etc.
-  //
-  // 3. Actually pull the requested chunks out of the buffer and return.
-
-  // if we need a readable event, then we need to do some reading.
-  var doRead = state.needReadable;
-  debug('need readable', doRead);
-
-  // if we currently have less than the highWaterMark, then also read some
-  if (state.length === 0 || state.length - n < state.highWaterMark) {
-    doRead = true;
-    debug('length less than watermark', doRead);
-  }
-
-  // however, if we've ended, then there's no point, and if we're already
-  // reading, then it's unnecessary.
-  if (state.ended || state.reading) {
-    doRead = false;
-    debug('reading or ended', doRead);
-  }
-
-  if (doRead) {
-    debug('do read');
-    state.reading = true;
-    state.sync = true;
-    // if the length is currently zero, then we *need* a readable event.
-    if (state.length === 0) state.needReadable = true;
-    // call internal read method
-    this._read(state.highWaterMark);
-    state.sync = false;
-  }
-
-  // If _read pushed data synchronously, then `reading` will be false,
-  // and we need to re-evaluate how much data we can return to the user.
-  if (doRead && !state.reading) n = howMuchToRead(nOrig, state);
-
-  var ret;
-  if (n > 0) ret = fromList(n, state);else ret = null;
-
-  if (ret === null) {
-    state.needReadable = true;
-    n = 0;
-  }
-
-  state.length -= n;
-
-  // If we have nothing in the buffer, then we want to know
-  // as soon as we *do* get something into the buffer.
-  if (state.length === 0 && !state.ended) state.needReadable = true;
-
-  // If we tried to read() past the EOF, then emit end on the next tick.
-  if (nOrig !== n && state.ended && state.length === 0) endReadable(this);
-
-  if (ret !== null) this.emit('data', ret);
-
-  return ret;
-};
-
-function chunkInvalid(state, chunk) {
-  var er = null;
-  if (!Buffer.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== null && chunk !== undefined && !state.objectMode) {
-    er = new TypeError('Invalid non-string/buffer chunk');
-  }
-  return er;
-}
-
-function onEofChunk(stream, state) {
-  if (state.ended) return;
-  if (state.decoder) {
-    var chunk = state.decoder.end();
-    if (chunk && chunk.length) {
-      state.buffer.push(chunk);
-      state.length += state.objectMode ? 1 : chunk.length;
-    }
-  }
-  state.ended = true;
-
-  // emit 'readable' now to make sure it gets picked up.
-  emitReadable(stream);
-}
-
-// Don't emit readable right away in sync mode, because this can trigger
-// another read() call => stack overflow.  This way, it might trigger
-// a nextTick recursion warning, but that's not so bad.
-function emitReadable(stream) {
-  var state = stream._readableState;
-  state.needReadable = false;
-  if (!state.emittedReadable) {
-    debug('emitReadable', state.flowing);
-    state.emittedReadable = true;
-    if (state.sync) processNextTick(emitReadable_, stream);else emitReadable_(stream);
-  }
-}
-
-function emitReadable_(stream) {
-  debug('emit readable');
-  stream.emit('readable');
-  flow(stream);
-}
-
-// at this point, the user has presumably seen the 'readable' event,
-// and called read() to consume some data.  that may have triggered
-// in turn another _read(n) call, in which case reading = true if
-// it's in progress.
-// However, if we're not ended, or reading, and the length < hwm,
-// then go ahead and try to read some more preemptively.
-function maybeReadMore(stream, state) {
-  if (!state.readingMore) {
-    state.readingMore = true;
-    processNextTick(maybeReadMore_, stream, state);
-  }
-}
-
-function maybeReadMore_(stream, state) {
-  var len = state.length;
-  while (!state.reading && !state.flowing && !state.ended && state.length < state.highWaterMark) {
-    debug('maybeReadMore read 0');
-    stream.read(0);
-    if (len === state.length)
-      // didn't get any data, stop spinning.
-      break;else len = state.length;
-  }
-  state.readingMore = false;
-}
-
-// abstract method.  to be overridden in specific implementation classes.
-// call cb(er, data) where data is <= n in length.
-// for virtual (non-string, non-buffer) streams, "length" is somewhat
-// arbitrary, and perhaps not very meaningful.
-Readable.prototype._read = function (n) {
-  this.emit('error', new Error('not implemented'));
-};
-
-Readable.prototype.pipe = function (dest, pipeOpts) {
-  var src = this;
-  var state = this._readableState;
-
-  switch (state.pipesCount) {
-    case 0:
-      state.pipes = dest;
-      break;
-    case 1:
-      state.pipes = [state.pipes, dest];
-      break;
-    default:
-      state.pipes.push(dest);
-      break;
-  }
-  state.pipesCount += 1;
-  debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);
-
-  var doEnd = (!pipeOpts || pipeOpts.end !== false) && dest !== process.stdout && dest !== process.stderr;
-
-  var endFn = doEnd ? onend : cleanup;
-  if (state.endEmitted) processNextTick(endFn);else src.once('end', endFn);
-
-  dest.on('unpipe', onunpipe);
-  function onunpipe(readable) {
-    debug('onunpipe');
-    if (readable === src) {
-      cleanup();
-    }
-  }
-
-  function onend() {
-    debug('onend');
-    dest.end();
-  }
-
-  // when the dest drains, it reduces the awaitDrain counter
-  // on the source.  This would be more elegant with a .once()
-  // handler in flow(), but adding and removing repeatedly is
-  // too slow.
-  var ondrain = pipeOnDrain(src);
-  dest.on('drain', ondrain);
-
-  var cleanedUp = false;
-  function cleanup() {
-    debug('cleanup');
-    // cleanup event handlers once the pipe is broken
-    dest.removeListener('close', onclose);
-    dest.removeListener('finish', onfinish);
-    dest.removeListener('drain', ondrain);
-    dest.removeListener('error', onerror);
-    dest.removeListener('unpipe', onunpipe);
-    src.removeListener('end', onend);
-    src.removeListener('end', cleanup);
-    src.removeListener('data', ondata);
-
-    cleanedUp = true;
-
-    // if the reader is waiting for a drain event from this
-    // specific writer, then it would cause it to never start
-    // flowing again.
-    // So, if this is awaiting a drain, then we just call it now.
-    // If we don't know, then assume that we are waiting for one.
-    if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain();
-  }
-
-  src.on('data', ondata);
-  function ondata(chunk) {
-    debug('ondata');
-    var ret = dest.write(chunk);
-    if (false === ret) {
-      // If the user unpiped during `dest.write()`, it is possible
-      // to get stuck in a permanently paused state if that write
-      // also returned false.
-      if (state.pipesCount === 1 && state.pipes[0] === dest && src.listenerCount('data') === 1 && !cleanedUp) {
-        debug('false write response, pause', src._readableState.awaitDrain);
-        src._readableState.awaitDrain++;
-      }
-      src.pause();
-    }
-  }
-
-  // if the dest has an error, then stop piping into it.
-  // however, don't suppress the throwing behavior for this.
-  function onerror(er) {
-    debug('onerror', er);
-    unpipe();
-    dest.removeListener('error', onerror);
-    if (EElistenerCount(dest, 'error') === 0) dest.emit('error', er);
-  }
-  // This is a brutally ugly hack to make sure that our error handler
-  // is attached before any userland ones.  NEVER DO THIS.
-  if (!dest._events || !dest._events.error) dest.on('error', onerror);else if (isArray(dest._events.error)) dest._events.error.unshift(onerror);else dest._events.error = [onerror, dest._events.error];
-
-  // Both close and finish should trigger unpipe, but only once.
-  function onclose() {
-    dest.removeListener('finish', onfinish);
-    unpipe();
-  }
-  dest.once('close', onclose);
-  function onfinish() {
-    debug('onfinish');
-    dest.removeListener('close', onclose);
-    unpipe();
-  }
-  dest.once('finish', onfinish);
-
-  function unpipe() {
-    debug('unpipe');
-    src.unpipe(dest);
-  }
-
-  // tell the dest that it's being piped to
-  dest.emit('pipe', src);
-
-  // start the flow if it hasn't been started already.
-  if (!state.flowing) {
-    debug('pipe resume');
-    src.resume();
-  }
-
-  return dest;
-};
-
-function pipeOnDrain(src) {
-  return function () {
-    var state = src._readableState;
-    debug('pipeOnDrain', state.awaitDrain);
-    if (state.awaitDrain) state.awaitDrain--;
-    if (state.awaitDrain === 0 && EElistenerCount(src, 'data')) {
-      state.flowing = true;
-      flow(src);
-    }
-  };
-}
-
-Readable.prototype.unpipe = function (dest) {
-  var state = this._readableState;
-
-  // if we're not piping anywhere, then do nothing.
-  if (state.pipesCount === 0) return this;
-
-  // just one destination.  most common case.
-  if (state.pipesCount === 1) {
-    // passed in one, but it's not the right one.
-    if (dest && dest !== state.pipes) return this;
-
-    if (!dest) dest = state.pipes;
-
-    // got a match.
-    state.pipes = null;
-    state.pipesCount = 0;
-    state.flowing = false;
-    if (dest) dest.emit('unpipe', this);
-    return this;
-  }
-
-  // slow case. multiple pipe destinations.
-
-  if (!dest) {
-    // remove all.
-    var dests = state.pipes;
-    var len = state.pipesCount;
-    state.pipes = null;
-    state.pipesCount = 0;
-    state.flowing = false;
-
-    for (var _i = 0; _i < len; _i++) {
-      dests[_i].emit('unpipe', this);
-    }return this;
-  }
-
-  // try to find the right one.
-  var i = indexOf(state.pipes, dest);
-  if (i === -1) return this;
-
-  state.pipes.splice(i, 1);
-  state.pipesCount -= 1;
-  if (state.pipesCount === 1) state.pipes = state.pipes[0];
-
-  dest.emit('unpipe', this);
-
-  return this;
-};
-
-// set up data events if they are asked for
-// Ensure readable listeners eventually get something
-Readable.prototype.on = function (ev, fn) {
-  var res = Stream.prototype.on.call(this, ev, fn);
-
-  // If listening to data, and it has not explicitly been paused,
-  // then call resume to start the flow of data on the next tick.
-  if (ev === 'data' && false !== this._readableState.flowing) {
-    this.resume();
-  }
-
-  if (ev === 'readable' && !this._readableState.endEmitted) {
-    var state = this._readableState;
-    if (!state.readableListening) {
-      state.readableListening = true;
-      state.emittedReadable = false;
-      state.needReadable = true;
-      if (!state.reading) {
-        processNextTick(nReadingNextTick, this);
-      } else if (state.length) {
-        emitReadable(this, state);
-      }
-    }
-  }
-
-  return res;
-};
-Readable.prototype.addListener = Readable.prototype.on;
-
-function nReadingNextTick(self) {
-  debug('readable nexttick read 0');
-  self.read(0);
-}
-
-// pause() and resume() are remnants of the legacy readable stream API
-// If the user uses them, then switch into old mode.
-Readable.prototype.resume = function () {
-  var state = this._readableState;
-  if (!state.flowing) {
-    debug('resume');
-    state.flowing = true;
-    resume(this, state);
-  }
-  return this;
-};
-
-function resume(stream, state) {
-  if (!state.resumeScheduled) {
-    state.resumeScheduled = true;
-    processNextTick(resume_, stream, state);
-  }
-}
-
-function resume_(stream, state) {
-  if (!state.reading) {
-    debug('resume read 0');
-    stream.read(0);
-  }
-
-  state.resumeScheduled = false;
-  stream.emit('resume');
-  flow(stream);
-  if (state.flowing && !state.reading) stream.read(0);
-}
-
-Readable.prototype.pause = function () {
-  debug('call pause flowing=%j', this._readableState.flowing);
-  if (false !== this._readableState.flowing) {
-    debug('pause');
-    this._readableState.flowing = false;
-    this.emit('pause');
-  }
-  return this;
-};
-
-function flow(stream) {
-  var state = stream._readableState;
-  debug('flow', state.flowing);
-  if (state.flowing) {
-    do {
-      var chunk = stream.read();
-    } while (null !== chunk && state.flowing);
-  }
-}
-
-// wrap an old-style stream as the async data source.
-// This is *not* part of the readable stream interface.
-// It is an ugly unfortunate mess of history.
-Readable.prototype.wrap = function (stream) {
-  var state = this._readableState;
-  var paused = false;
-
-  var self = this;
-  stream.on('end', function () {
-    debug('wrapped end');
-    if (state.decoder && !state.ended) {
-      var chunk = state.decoder.end();
-      if (chunk && chunk.length) self.push(chunk);
-    }
-
-    self.push(null);
-  });
-
-  stream.on('data', function (chunk) {
-    debug('wrapped data');
-    if (state.decoder) chunk = state.decoder.write(chunk);
-
-    // don't skip over falsy values in objectMode
-    if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return;
-
-    var ret = self.push(chunk);
-    if (!ret) {
-      paused = true;
-      stream.pause();
-    }
-  });
-
-  // proxy all the other methods.
-  // important when wrapping filters and duplexes.
-  for (var i in stream) {
-    if (this[i] === undefined && typeof stream[i] === 'function') {
-      this[i] = function (method) {
-        return function () {
-          return stream[method].apply(stream, arguments);
-        };
-      }(i);
-    }
-  }
-
-  // proxy certain important events.
-  var events = ['error', 'close', 'destroy', 'pause', 'resume'];
-  forEach(events, function (ev) {
-    stream.on(ev, self.emit.bind(self, ev));
-  });
-
-  // when we try to consume some more bytes, simply unpause the
-  // underlying stream.
-  self._read = function (n) {
-    debug('wrapped _read', n);
-    if (paused) {
-      paused = false;
-      stream.resume();
-    }
-  };
-
-  return self;
-};
-
-// exposed for testing purposes only.
-Readable._fromList = fromList;
-
-// Pluck off n bytes from an array of buffers.
-// Length is the combined lengths of all the buffers in the list.
-function fromList(n, state) {
-  var list = state.buffer;
-  var length = state.length;
-  var stringMode = !!state.decoder;
-  var objectMode = !!state.objectMode;
-  var ret;
-
-  // nothing in the list, definitely empty.
-  if (list.length === 0) return null;
-
-  if (length === 0) ret = null;else if (objectMode) ret = list.shift();else if (!n || n >= length) {
-    // read it all, truncate the array.
-    if (stringMode) ret = list.join('');else if (list.length === 1) ret = list[0];else ret = Buffer.concat(list, length);
-    list.length = 0;
-  } else {
-    // read just some of it.
-    if (n < list[0].length) {
-      // just take a part of the first list item.
-      // slice is the same for buffers and strings.
-      var buf = list[0];
-      ret = buf.slice(0, n);
-      list[0] = buf.slice(n);
-    } else if (n === list[0].length) {
-      // first list is a perfect match
-      ret = list.shift();
-    } else {
-      // complex case.
-      // we have enough to cover it, but it spans past the first buffer.
-      if (stringMode) ret = '';else ret = new Buffer(n);
-
-      var c = 0;
-      for (var i = 0, l = list.length; i < l && c < n; i++) {
-        var buf = list[0];
-        var cpy = Math.min(n - c, buf.length);
-
-        if (stringMode) ret += buf.slice(0, cpy);else buf.copy(ret, c, 0, cpy);
-
-        if (cpy < buf.length) list[0] = buf.slice(cpy);else list.shift();
-
-        c += cpy;
-      }
-    }
-  }
-
-  return ret;
-}
-
-function endReadable(stream) {
-  var state = stream._readableState;
-
-  // If we get here before consuming all the bytes, then that is a
-  // bug in node.  Should never happen.
-  if (state.length > 0) throw new Error('endReadable called on non-empty stream');
-
-  if (!state.endEmitted) {
-    state.ended = true;
-    processNextTick(endReadableNT, state, stream);
-  }
-}
-
-function endReadableNT(state, stream) {
-  // Check that we didn't get one last unshift.
-  if (!state.endEmitted && state.length === 0) {
-    state.endEmitted = true;
-    stream.readable = false;
-    stream.emit('end');
-  }
-}
-
-function forEach(xs, f) {
-  for (var i = 0, l = xs.length; i < l; i++) {
-    f(xs[i], i);
-  }
-}
-
-function indexOf(xs, x) {
-  for (var i = 0, l = xs.length; i < l; i++) {
-    if (xs[i] === x) return i;
-  }
-  return -1;
-}
\ No newline at end of file
diff --git a/node_modules/concat-stream/node_modules/readable-stream/lib/_stream_transform.js b/node_modules/concat-stream/node_modules/readable-stream/lib/_stream_transform.js
deleted file mode 100644
index 625cdc176..000000000
--- a/node_modules/concat-stream/node_modules/readable-stream/lib/_stream_transform.js
+++ /dev/null
@@ -1,180 +0,0 @@
-// a transform stream is a readable/writable stream where you do
-// something with the data.  Sometimes it's called a "filter",
-// but that's not a great name for it, since that implies a thing where
-// some bits pass through, and others are simply ignored.  (That would
-// be a valid example of a transform, of course.)
-//
-// While the output is causally related to the input, it's not a
-// necessarily symmetric or synchronous transformation.  For example,
-// a zlib stream might take multiple plain-text writes(), and then
-// emit a single compressed chunk some time in the future.
-//
-// Here's how this works:
-//
-// The Transform stream has all the aspects of the readable and writable
-// stream classes.  When you write(chunk), that calls _write(chunk,cb)
-// internally, and returns false if there's a lot of pending writes
-// buffered up.  When you call read(), that calls _read(n) until
-// there's enough pending readable data buffered up.
-//
-// In a transform stream, the written data is placed in a buffer.  When
-// _read(n) is called, it transforms the queued up data, calling the
-// buffered _write cb's as it consumes chunks.  If consuming a single
-// written chunk would result in multiple output chunks, then the first
-// outputted bit calls the readcb, and subsequent chunks just go into
-// the read buffer, and will cause it to emit 'readable' if necessary.
-//
-// This way, back-pressure is actually determined by the reading side,
-// since _read has to be called to start processing a new chunk.  However,
-// a pathological inflate type of transform can cause excessive buffering
-// here.  For example, imagine a stream where every byte of input is
-// interpreted as an integer from 0-255, and then results in that many
-// bytes of output.  Writing the 4 bytes {ff,ff,ff,ff} would result in
-// 1kb of data being output.  In this case, you could write a very small
-// amount of input, and end up with a very large amount of output.  In
-// such a pathological inflating mechanism, there'd be no way to tell
-// the system to stop doing the transform.  A single 4MB write could
-// cause the system to run out of memory.
-//
-// However, even in such a pathological case, only a single written chunk
-// would be consumed, and then the rest would wait (un-transformed) until
-// the results of the previous transformed chunk were consumed.
-
-'use strict';
-
-module.exports = Transform;
-
-var Duplex = require('./_stream_duplex');
-
-/*<replacement>*/
-var util = require('core-util-is');
-util.inherits = require('inherits');
-/*</replacement>*/
-
-util.inherits(Transform, Duplex);
-
-function TransformState(stream) {
-  this.afterTransform = function (er, data) {
-    return afterTransform(stream, er, data);
-  };
-
-  this.needTransform = false;
-  this.transforming = false;
-  this.writecb = null;
-  this.writechunk = null;
-  this.writeencoding = null;
-}
-
-function afterTransform(stream, er, data) {
-  var ts = stream._transformState;
-  ts.transforming = false;
-
-  var cb = ts.writecb;
-
-  if (!cb) return stream.emit('error', new Error('no writecb in Transform class'));
-
-  ts.writechunk = null;
-  ts.writecb = null;
-
-  if (data !== null && data !== undefined) stream.push(data);
-
-  cb(er);
-
-  var rs = stream._readableState;
-  rs.reading = false;
-  if (rs.needReadable || rs.length < rs.highWaterMark) {
-    stream._read(rs.highWaterMark);
-  }
-}
-
-function Transform(options) {
-  if (!(this instanceof Transform)) return new Transform(options);
-
-  Duplex.call(this, options);
-
-  this._transformState = new TransformState(this);
-
-  // when the writable side finishes, then flush out anything remaining.
-  var stream = this;
-
-  // start out asking for a readable event once data is transformed.
-  this._readableState.needReadable = true;
-
-  // we have implemented the _read method, and done the other things
-  // that Readable wants before the first _read call, so unset the
-  // sync guard flag.
-  this._readableState.sync = false;
-
-  if (options) {
-    if (typeof options.transform === 'function') this._transform = options.transform;
-
-    if (typeof options.flush === 'function') this._flush = options.flush;
-  }
-
-  this.once('prefinish', function () {
-    if (typeof this._flush === 'function') this._flush(function (er) {
-      done(stream, er);
-    });else done(stream);
-  });
-}
-
-Transform.prototype.push = function (chunk, encoding) {
-  this._transformState.needTransform = false;
-  return Duplex.prototype.push.call(this, chunk, encoding);
-};
-
-// This is the part where you do stuff!
-// override this function in implementation classes.
-// 'chunk' is an input chunk.
-//
-// Call `push(newChunk)` to pass along transformed output
-// to the readable side.  You may call 'push' zero or more times.
-//
-// Call `cb(err)` when you are done with this chunk.  If you pass
-// an error, then that'll put the hurt on the whole operation.  If you
-// never call cb(), then you'll never get another chunk.
-Transform.prototype._transform = function (chunk, encoding, cb) {
-  throw new Error('not implemented');
-};
-
-Transform.prototype._write = function (chunk, encoding, cb) {
-  var ts = this._transformState;
-  ts.writecb = cb;
-  ts.writechunk = chunk;
-  ts.writeencoding = encoding;
-  if (!ts.transforming) {
-    var rs = this._readableState;
-    if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark);
-  }
-};
-
-// Doesn't matter what the args are here.
-// _transform does all the work.
-// That we got here means that the readable side wants more data.
-Transform.prototype._read = function (n) {
-  var ts = this._transformState;
-
-  if (ts.writechunk !== null && ts.writecb && !ts.transforming) {
-    ts.transforming = true;
-    this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);
-  } else {
-    // mark that we need a transform, so that any data that comes in
-    // will get processed, now that we've asked for it.
-    ts.needTransform = true;
-  }
-};
-
-function done(stream, er) {
-  if (er) return stream.emit('error', er);
-
-  // if there's nothing in the write buffer, then that means
-  // that nothing more will ever be provided
-  var ws = stream._writableState;
-  var ts = stream._transformState;
-
-  if (ws.length) throw new Error('calling transform done when ws.length != 0');
-
-  if (ts.transforming) throw new Error('calling transform done when still transforming');
-
-  return stream.push(null);
-}
\ No newline at end of file
diff --git a/node_modules/concat-stream/node_modules/readable-stream/lib/_stream_writable.js b/node_modules/concat-stream/node_modules/readable-stream/lib/_stream_writable.js
deleted file mode 100644
index 95916c992..000000000
--- a/node_modules/concat-stream/node_modules/readable-stream/lib/_stream_writable.js
+++ /dev/null
@@ -1,516 +0,0 @@
-// A bit simpler than readable streams.
-// Implement an async ._write(chunk, encoding, cb), and it'll handle all
-// the drain event emission and buffering.
-
-'use strict';
-
-module.exports = Writable;
-
-/*<replacement>*/
-var processNextTick = require('process-nextick-args');
-/*</replacement>*/
-
-/*<replacement>*/
-var asyncWrite = !process.browser && ['v0.10', 'v0.9.'].indexOf(process.version.slice(0, 5)) > -1 ? setImmediate : processNextTick;
-/*</replacement>*/
-
-/*<replacement>*/
-var Buffer = require('buffer').Buffer;
-/*</replacement>*/
-
-Writable.WritableState = WritableState;
-
-/*<replacement>*/
-var util = require('core-util-is');
-util.inherits = require('inherits');
-/*</replacement>*/
-
-/*<replacement>*/
-var internalUtil = {
-  deprecate: require('util-deprecate')
-};
-/*</replacement>*/
-
-/*<replacement>*/
-var Stream;
-(function () {
-  try {
-    Stream = require('st' + 'ream');
-  } catch (_) {} finally {
-    if (!Stream) Stream = require('events').EventEmitter;
-  }
-})();
-/*</replacement>*/
-
-var Buffer = require('buffer').Buffer;
-
-util.inherits(Writable, Stream);
-
-function nop() {}
-
-function WriteReq(chunk, encoding, cb) {
-  this.chunk = chunk;
-  this.encoding = encoding;
-  this.callback = cb;
-  this.next = null;
-}
-
-var Duplex;
-function WritableState(options, stream) {
-  Duplex = Duplex || require('./_stream_duplex');
-
-  options = options || {};
-
-  // object stream flag to indicate whether or not this stream
-  // contains buffers or objects.
-  this.objectMode = !!options.objectMode;
-
-  if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.writableObjectMode;
-
-  // the point at which write() starts returning false
-  // Note: 0 is a valid value, means that we always return false if
-  // the entire buffer is not flushed immediately on write()
-  var hwm = options.highWaterMark;
-  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
-  this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;
-
-  // cast to ints.
-  this.highWaterMark = ~ ~this.highWaterMark;
-
-  this.needDrain = false;
-  // at the start of calling end()
-  this.ending = false;
-  // when end() has been called, and returned
-  this.ended = false;
-  // when 'finish' is emitted
-  this.finished = false;
-
-  // should we decode strings into buffers before passing to _write?
-  // this is here so that some node-core streams can optimize string
-  // handling at a lower level.
-  var noDecode = options.decodeStrings === false;
-  this.decodeStrings = !noDecode;
-
-  // Crypto is kind of old and crusty.  Historically, its default string
-  // encoding is 'binary' so we have to make this configurable.
-  // Everything else in the universe uses 'utf8', though.
-  this.defaultEncoding = options.defaultEncoding || 'utf8';
-
-  // not an actual buffer we keep track of, but a measurement
-  // of how much we're waiting to get pushed to some underlying
-  // socket or file.
-  this.length = 0;
-
-  // a flag to see when we're in the middle of a write.
-  this.writing = false;
-
-  // when true all writes will be buffered until .uncork() call
-  this.corked = 0;
-
-  // a flag to be able to tell if the onwrite cb is called immediately,
-  // or on a later tick.  We set this to true at first, because any
-  // actions that shouldn't happen until "later" should generally also
-  // not happen before the first write call.
-  this.sync = true;
-
-  // a flag to know if we're processing previously buffered items, which
-  // may call the _write() callback in the same tick, so that we don't
-  // end up in an overlapped onwrite situation.
-  this.bufferProcessing = false;
-
-  // the callback that's passed to _write(chunk,cb)
-  this.onwrite = function (er) {
-    onwrite(stream, er);
-  };
-
-  // the callback that the user supplies to write(chunk,encoding,cb)
-  this.writecb = null;
-
-  // the amount that is being written when _write is called.
-  this.writelen = 0;
-
-  this.bufferedRequest = null;
-  this.lastBufferedRequest = null;
-
-  // number of pending user-supplied write callbacks
-  // this must be 0 before 'finish' can be emitted
-  this.pendingcb = 0;
-
-  // emit prefinish if the only thing we're waiting for is _write cbs
-  // This is relevant for synchronous Transform streams
-  this.prefinished = false;
-
-  // True if the error was already emitted and should not be thrown again
-  this.errorEmitted = false;
-
-  // count buffered requests
-  this.bufferedRequestCount = 0;
-
-  // create the two objects needed to store the corked requests
-  // they are not a linked list, as no new elements are inserted in there
-  this.corkedRequestsFree = new CorkedRequest(this);
-  this.corkedRequestsFree.next = new CorkedRequest(this);
-}
-
-WritableState.prototype.getBuffer = function writableStateGetBuffer() {
-  var current = this.bufferedRequest;
-  var out = [];
-  while (current) {
-    out.push(current);
-    current = current.next;
-  }
-  return out;
-};
-
-(function () {
-  try {
-    Object.defineProperty(WritableState.prototype, 'buffer', {
-      get: internalUtil.deprecate(function () {
-        return this.getBuffer();
-      }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.')
-    });
-  } catch (_) {}
-})();
-
-var Duplex;
-function Writable(options) {
-  Duplex = Duplex || require('./_stream_duplex');
-
-  // Writable ctor is applied to Duplexes, though they're not
-  // instanceof Writable, they're instanceof Readable.
-  if (!(this instanceof Writable) && !(this instanceof Duplex)) return new Writable(options);
-
-  this._writableState = new WritableState(options, this);
-
-  // legacy.
-  this.writable = true;
-
-  if (options) {
-    if (typeof options.write === 'function') this._write = options.write;
-
-    if (typeof options.writev === 'function') this._writev = options.writev;
-  }
-
-  Stream.call(this);
-}
-
-// Otherwise people can pipe Writable streams, which is just wrong.
-Writable.prototype.pipe = function () {
-  this.emit('error', new Error('Cannot pipe. Not readable.'));
-};
-
-function writeAfterEnd(stream, cb) {
-  var er = new Error('write after end');
-  // TODO: defer error events consistently everywhere, not just the cb
-  stream.emit('error', er);
-  processNextTick(cb, er);
-}
-
-// If we get something that is not a buffer, string, null, or undefined,
-// and we're not in objectMode, then that's an error.
-// Otherwise stream chunks are all considered to be of length=1, and the
-// watermarks determine how many objects to keep in the buffer, rather than
-// how many bytes or characters.
-function validChunk(stream, state, chunk, cb) {
-  var valid = true;
-
-  if (!Buffer.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== null && chunk !== undefined && !state.objectMode) {
-    var er = new TypeError('Invalid non-string/buffer chunk');
-    stream.emit('error', er);
-    processNextTick(cb, er);
-    valid = false;
-  }
-  return valid;
-}
-
-Writable.prototype.write = function (chunk, encoding, cb) {
-  var state = this._writableState;
-  var ret = false;
-
-  if (typeof encoding === 'function') {
-    cb = encoding;
-    encoding = null;
-  }
-
-  if (Buffer.isBuffer(chunk)) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding;
-
-  if (typeof cb !== 'function') cb = nop;
-
-  if (state.ended) writeAfterEnd(this, cb);else if (validChunk(this, state, chunk, cb)) {
-    state.pendingcb++;
-    ret = writeOrBuffer(this, state, chunk, encoding, cb);
-  }
-
-  return ret;
-};
-
-Writable.prototype.cork = function () {
-  var state = this._writableState;
-
-  state.corked++;
-};
-
-Writable.prototype.uncork = function () {
-  var state = this._writableState;
-
-  if (state.corked) {
-    state.corked--;
-
-    if (!state.writing && !state.corked && !state.finished && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state);
-  }
-};
-
-Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {
-  // node::ParseEncoding() requires lower case.
-  if (typeof encoding === 'string') encoding = encoding.toLowerCase();
-  if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new TypeError('Unknown encoding: ' + encoding);
-  this._writableState.defaultEncoding = encoding;
-};
-
-function decodeChunk(state, chunk, encoding) {
-  if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {
-    chunk = new Buffer(chunk, encoding);
-  }
-  return chunk;
-}
-
-// if we're already writing something, then just put this
-// in the queue, and wait our turn.  Otherwise, call _write
-// If we return false, then we need a drain event, so set that flag.
-function writeOrBuffer(stream, state, chunk, encoding, cb) {
-  chunk = decodeChunk(state, chunk, encoding);
-
-  if (Buffer.isBuffer(chunk)) encoding = 'buffer';
-  var len = state.objectMode ? 1 : chunk.length;
-
-  state.length += len;
-
-  var ret = state.length < state.highWaterMark;
-  // we must ensure that previous needDrain will not be reset to false.
-  if (!ret) state.needDrain = true;
-
-  if (state.writing || state.corked) {
-    var last = state.lastBufferedRequest;
-    state.lastBufferedRequest = new WriteReq(chunk, encoding, cb);
-    if (last) {
-      last.next = state.lastBufferedRequest;
-    } else {
-      state.bufferedRequest = state.lastBufferedRequest;
-    }
-    state.bufferedRequestCount += 1;
-  } else {
-    doWrite(stream, state, false, len, chunk, encoding, cb);
-  }
-
-  return ret;
-}
-
-function doWrite(stream, state, writev, len, chunk, encoding, cb) {
-  state.writelen = len;
-  state.writecb = cb;
-  state.writing = true;
-  state.sync = true;
-  if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite);
-  state.sync = false;
-}
-
-function onwriteError(stream, state, sync, er, cb) {
-  --state.pendingcb;
-  if (sync) processNextTick(cb, er);else cb(er);
-
-  stream._writableState.errorEmitted = true;
-  stream.emit('error', er);
-}
-
-function onwriteStateUpdate(state) {
-  state.writing = false;
-  state.writecb = null;
-  state.length -= state.writelen;
-  state.writelen = 0;
-}
-
-function onwrite(stream, er) {
-  var state = stream._writableState;
-  var sync = state.sync;
-  var cb = state.writecb;
-
-  onwriteStateUpdate(state);
-
-  if (er) onwriteError(stream, state, sync, er, cb);else {
-    // Check if we're actually ready to finish, but don't emit yet
-    var finished = needFinish(state);
-
-    if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {
-      clearBuffer(stream, state);
-    }
-
-    if (sync) {
-      /*<replacement>*/
-      asyncWrite(afterWrite, stream, state, finished, cb);
-      /*</replacement>*/
-    } else {
-        afterWrite(stream, state, finished, cb);
-      }
-  }
-}
-
-function afterWrite(stream, state, finished, cb) {
-  if (!finished) onwriteDrain(stream, state);
-  state.pendingcb--;
-  cb();
-  finishMaybe(stream, state);
-}
-
-// Must force callback to be called on nextTick, so that we don't
-// emit 'drain' before the write() consumer gets the 'false' return
-// value, and has a chance to attach a 'drain' listener.
-function onwriteDrain(stream, state) {
-  if (state.length === 0 && state.needDrain) {
-    state.needDrain = false;
-    stream.emit('drain');
-  }
-}
-
-// if there's something in the buffer waiting, then process it
-function clearBuffer(stream, state) {
-  state.bufferProcessing = true;
-  var entry = state.bufferedRequest;
-
-  if (stream._writev && entry && entry.next) {
-    // Fast case, write everything using _writev()
-    var l = state.bufferedRequestCount;
-    var buffer = new Array(l);
-    var holder = state.corkedRequestsFree;
-    holder.entry = entry;
-
-    var count = 0;
-    while (entry) {
-      buffer[count] = entry;
-      entry = entry.next;
-      count += 1;
-    }
-
-    doWrite(stream, state, true, state.length, buffer, '', holder.finish);
-
-    // doWrite is always async, defer these to save a bit of time
-    // as the hot path ends with doWrite
-    state.pendingcb++;
-    state.lastBufferedRequest = null;
-    state.corkedRequestsFree = holder.next;
-    holder.next = null;
-  } else {
-    // Slow case, write chunks one-by-one
-    while (entry) {
-      var chunk = entry.chunk;
-      var encoding = entry.encoding;
-      var cb = entry.callback;
-      var len = state.objectMode ? 1 : chunk.length;
-
-      doWrite(stream, state, false, len, chunk, encoding, cb);
-      entry = entry.next;
-      // if we didn't call the onwrite immediately, then
-      // it means that we need to wait until it does.
-      // also, that means that the chunk and cb are currently
-      // being processed, so move the buffer counter past them.
-      if (state.writing) {
-        break;
-      }
-    }
-
-    if (entry === null) state.lastBufferedRequest = null;
-  }
-
-  state.bufferedRequestCount = 0;
-  state.bufferedRequest = entry;
-  state.bufferProcessing = false;
-}
-
-Writable.prototype._write = function (chunk, encoding, cb) {
-  cb(new Error('not implemented'));
-};
-
-Writable.prototype._writev = null;
-
-Writable.prototype.end = function (chunk, encoding, cb) {
-  var state = this._writableState;
-
-  if (typeof chunk === 'function') {
-    cb = chunk;
-    chunk = null;
-    encoding = null;
-  } else if (typeof encoding === 'function') {
-    cb = encoding;
-    encoding = null;
-  }
-
-  if (chunk !== null && chunk !== undefined) this.write(chunk, encoding);
-
-  // .end() fully uncorks
-  if (state.corked) {
-    state.corked = 1;
-    this.uncork();
-  }
-
-  // ignore unnecessary end() calls.
-  if (!state.ending && !state.finished) endWritable(this, state, cb);
-};
-
-function needFinish(state) {
-  return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;
-}
-
-function prefinish(stream, state) {
-  if (!state.prefinished) {
-    state.prefinished = true;
-    stream.emit('prefinish');
-  }
-}
-
-function finishMaybe(stream, state) {
-  var need = needFinish(state);
-  if (need) {
-    if (state.pendingcb === 0) {
-      prefinish(stream, state);
-      state.finished = true;
-      stream.emit('finish');
-    } else {
-      prefinish(stream, state);
-    }
-  }
-  return need;
-}
-
-function endWritable(stream, state, cb) {
-  state.ending = true;
-  finishMaybe(stream, state);
-  if (cb) {
-    if (state.finished) processNextTick(cb);else stream.once('finish', cb);
-  }
-  state.ended = true;
-  stream.writable = false;
-}
-
-// It seems a linked list but it is not
-// there will be only 2 of these for each stream
-function CorkedRequest(state) {
-  var _this = this;
-
-  this.next = null;
-  this.entry = null;
-
-  this.finish = function (err) {
-    var entry = _this.entry;
-    _this.entry = null;
-    while (entry) {
-      var cb = entry.callback;
-      state.pendingcb--;
-      cb(err);
-      entry = entry.next;
-    }
-    if (state.corkedRequestsFree) {
-      state.corkedRequestsFree.next = _this;
-    } else {
-      state.corkedRequestsFree = _this;
-    }
-  };
-}
\ No newline at end of file
diff --git a/node_modules/concat-stream/node_modules/readable-stream/package.json b/node_modules/concat-stream/node_modules/readable-stream/package.json
deleted file mode 100644
index d77b090ec..000000000
--- a/node_modules/concat-stream/node_modules/readable-stream/package.json
+++ /dev/null
@@ -1,37 +0,0 @@
-{
-  "name": "readable-stream",
-  "version": "2.0.6",
-  "description": "Streams3, a user-land copy of the stream library from Node.js",
-  "main": "readable.js",
-  "dependencies": {
-    "core-util-is": "~1.0.0",
-    "inherits": "~2.0.1",
-    "isarray": "~1.0.0",
-    "process-nextick-args": "~1.0.6",
-    "string_decoder": "~0.10.x",
-    "util-deprecate": "~1.0.1"
-  },
-  "devDependencies": {
-    "tap": "~0.2.6",
-    "tape": "~4.5.1",
-    "zuul": "~3.9.0"
-  },
-  "scripts": {
-    "test": "tap test/parallel/*.js test/ours/*.js",
-    "browser": "npm run write-zuul && zuul -- test/browser.js",
-    "write-zuul": "printf \"ui: tape\nbrowsers:\n  - name: $BROWSER_NAME\n    version: $BROWSER_VERSION\n\">.zuul.yml"
-  },
-  "repository": {
-    "type": "git",
-    "url": "git://github.com/nodejs/readable-stream"
-  },
-  "keywords": [
-    "readable",
-    "stream",
-    "pipe"
-  ],
-  "browser": {
-    "util": false
-  },
-  "license": "MIT"
-}
diff --git a/node_modules/concat-stream/node_modules/readable-stream/passthrough.js b/node_modules/concat-stream/node_modules/readable-stream/passthrough.js
deleted file mode 100644
index 27e8d8a55..000000000
--- a/node_modules/concat-stream/node_modules/readable-stream/passthrough.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = require("./lib/_stream_passthrough.js")
diff --git a/node_modules/concat-stream/node_modules/readable-stream/readable.js b/node_modules/concat-stream/node_modules/readable-stream/readable.js
deleted file mode 100644
index 6222a5798..000000000
--- a/node_modules/concat-stream/node_modules/readable-stream/readable.js
+++ /dev/null
@@ -1,12 +0,0 @@
-var Stream = (function (){
-  try {
-    return require('st' + 'ream'); // hack to fix a circular dependency issue when used with browserify
-  } catch(_){}
-}());
-exports = module.exports = require('./lib/_stream_readable.js');
-exports.Stream = Stream || exports;
-exports.Readable = exports;
-exports.Writable = require('./lib/_stream_writable.js');
-exports.Duplex = require('./lib/_stream_duplex.js');
-exports.Transform = require('./lib/_stream_transform.js');
-exports.PassThrough = require('./lib/_stream_passthrough.js');
diff --git a/node_modules/concat-stream/node_modules/readable-stream/transform.js b/node_modules/concat-stream/node_modules/readable-stream/transform.js
deleted file mode 100644
index 5d482f078..000000000
--- a/node_modules/concat-stream/node_modules/readable-stream/transform.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = require("./lib/_stream_transform.js")
diff --git a/node_modules/concat-stream/node_modules/readable-stream/writable.js b/node_modules/concat-stream/node_modules/readable-stream/writable.js
deleted file mode 100644
index e1e9efdf3..000000000
--- a/node_modules/concat-stream/node_modules/readable-stream/writable.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = require("./lib/_stream_writable.js")
diff --git a/node_modules/duplexify/node_modules/end-of-stream/.npmignore b/node_modules/duplexify/node_modules/end-of-stream/.npmignore
deleted file mode 100644
index 3c3629e64..000000000
--- a/node_modules/duplexify/node_modules/end-of-stream/.npmignore
+++ /dev/null
@@ -1 +0,0 @@
-node_modules
diff --git a/node_modules/duplexify/node_modules/end-of-stream/README.md b/node_modules/duplexify/node_modules/end-of-stream/README.md
deleted file mode 100644
index df800c1eb..000000000
--- a/node_modules/duplexify/node_modules/end-of-stream/README.md
+++ /dev/null
@@ -1,47 +0,0 @@
-# end-of-stream
-
-A node module that calls a callback when a readable/writable/duplex stream has completed or failed.
-
-	npm install end-of-stream
-
-## Usage
-
-Simply pass a stream and a callback to the `eos`.
-Both legacy streams and streams2 are supported.
-
-``` js
-var eos = require('end-of-stream');
-
-eos(readableStream, function(err) {
-	if (err) return console.log('stream had an error or closed early');
-	console.log('stream has ended');
-});
-
-eos(writableStream, function(err) {
-	if (err) return console.log('stream had an error or closed early');
-	console.log('stream has finished');
-});
-
-eos(duplexStream, function(err) {
-	if (err) return console.log('stream had an error or closed early');
-	console.log('stream has ended and finished');
-});
-
-eos(duplexStream, {readable:false}, function(err) {
-	if (err) return console.log('stream had an error or closed early');
-	console.log('stream has ended but might still be writable');
-});
-
-eos(duplexStream, {writable:false}, function(err) {
-	if (err) return console.log('stream had an error or closed early');
-	console.log('stream has ended but might still be readable');
-});
-
-eos(readableStream, {error:false}, function(err) {
-	// do not treat emit('error', err) as a end-of-stream
-});
-```
-
-## License
-
-MIT
\ No newline at end of file
diff --git a/node_modules/duplexify/node_modules/end-of-stream/index.js b/node_modules/duplexify/node_modules/end-of-stream/index.js
deleted file mode 100644
index 9f61ed5af..000000000
--- a/node_modules/duplexify/node_modules/end-of-stream/index.js
+++ /dev/null
@@ -1,72 +0,0 @@
-var once = require('once');
-
-var noop = function() {};
-
-var isRequest = function(stream) {
-	return stream.setHeader && typeof stream.abort === 'function';
-};
-
-var eos = function(stream, opts, callback) {
-	if (typeof opts === 'function') return eos(stream, null, opts);
-	if (!opts) opts = {};
-
-	callback = once(callback || noop);
-
-	var ws = stream._writableState;
-	var rs = stream._readableState;
-	var readable = opts.readable || (opts.readable !== false && stream.readable);
-	var writable = opts.writable || (opts.writable !== false && stream.writable);
-
-	var onlegacyfinish = function() {
-		if (!stream.writable) onfinish();
-	};
-
-	var onfinish = function() {
-		writable = false;
-		if (!readable) callback();
-	};
-
-	var onend = function() {
-		readable = false;
-		if (!writable) callback();
-	};
-
-	var onclose = function() {
-		if (readable && !(rs && rs.ended)) return callback(new Error('premature close'));
-		if (writable && !(ws && ws.ended)) return callback(new Error('premature close'));
-	};
-
-	var onrequest = function() {
-		stream.req.on('finish', onfinish);
-	};
-
-	if (isRequest(stream)) {
-		stream.on('complete', onfinish);
-		stream.on('abort', onclose);
-		if (stream.req) onrequest();
-		else stream.on('request', onrequest);
-	} else if (writable && !ws) { // legacy streams
-		stream.on('end', onlegacyfinish);
-		stream.on('close', onlegacyfinish);
-	}
-
-	stream.on('end', onend);
-	stream.on('finish', onfinish);
-	if (opts.error !== false) stream.on('error', callback);
-	stream.on('close', onclose);
-
-	return function() {
-		stream.removeListener('complete', onfinish);
-		stream.removeListener('abort', onclose);
-		stream.removeListener('request', onrequest);
-		if (stream.req) stream.req.removeListener('finish', onfinish);
-		stream.removeListener('end', onlegacyfinish);
-		stream.removeListener('close', onlegacyfinish);
-		stream.removeListener('finish', onfinish);
-		stream.removeListener('end', onend);
-		stream.removeListener('error', callback);
-		stream.removeListener('close', onclose);
-	};
-};
-
-module.exports = eos;
\ No newline at end of file
diff --git a/node_modules/duplexify/node_modules/end-of-stream/package.json b/node_modules/duplexify/node_modules/end-of-stream/package.json
deleted file mode 100644
index 5e36241b5..000000000
--- a/node_modules/duplexify/node_modules/end-of-stream/package.json
+++ /dev/null
@@ -1,31 +0,0 @@
-{
-  "name": "end-of-stream",
-  "version": "1.0.0",
-  "description": "Call a callback when a readable/writable/duplex stream has completed or failed.",
-  "repository": {
-    "type": "git",
-    "url": "git://github.com/mafintosh/end-of-stream.git"
-  },
-  "dependencies": {
-    "once": "~1.3.0"
-  },
-  "scripts": {
-    "test": "node test.js"
-  },
-  "keywords": [
-    "stream",
-    "streams",
-    "callback",
-    "finish",
-    "close",
-    "end",
-    "wait"
-  ],
-  "bugs": {
-    "url": "https://github.com/mafintosh/end-of-stream/issues"
-  },
-  "homepage": "https://github.com/mafintosh/end-of-stream",
-  "main": "index.js",
-  "author": "Mathias Buus <mathiasbuus@gmail.com>",
-  "license": "MIT"
-}
diff --git a/node_modules/duplexify/node_modules/end-of-stream/test.js b/node_modules/duplexify/node_modules/end-of-stream/test.js
deleted file mode 100644
index d4d126fe5..000000000
--- a/node_modules/duplexify/node_modules/end-of-stream/test.js
+++ /dev/null
@@ -1,62 +0,0 @@
-var assert = require('assert');
-var eos = require('./index');
-
-var expected = 6;
-var fs = require('fs');
-var net = require('net');
-
-var ws = fs.createWriteStream('/dev/null');
-eos(ws, function(err) {
-	expected--;
-	assert(!!err);
-	if (!expected) process.exit(0);
-});
-ws.close();
-
-var rs = fs.createReadStream('/dev/random');
-eos(rs, function(err) {
-	expected--;
-	assert(!!err);
-	if (!expected) process.exit(0);
-});
-rs.close();
-
-var rs = fs.createReadStream(__filename);
-eos(rs, function(err) {
-	expected--;
-	assert(!err);
-	if (!expected) process.exit(0);
-});
-rs.pipe(fs.createWriteStream('/dev/null'));
-
-var rs = fs.createReadStream(__filename);
-eos(rs, function(err) {
-	throw new Error('no go')
-})();
-rs.pipe(fs.createWriteStream('/dev/null'));
-
-var socket = net.connect(50000);
-eos(socket, function(err) {
-	expected--;
-	assert(!!err);
-	if (!expected) process.exit(0);
-});
-
-var server = net.createServer(function(socket) {
-	eos(socket, function() {
-		expected--;
-		if (!expected) process.exit(0);
-	});
-	socket.destroy();
-}).listen(30000, function() {
-	var socket = net.connect(30000);
-	eos(socket, function() {
-		expected--;
-		if (!expected) process.exit(0);
-	});
-});
-
-setTimeout(function() {
-	assert(expected === 0);
-	process.exit(0);
-}, 1000);
diff --git a/node_modules/duplexify/node_modules/once/LICENSE b/node_modules/duplexify/node_modules/once/LICENSE
deleted file mode 100644
index 19129e315..000000000
--- a/node_modules/duplexify/node_modules/once/LICENSE
+++ /dev/null
@@ -1,15 +0,0 @@
-The ISC License
-
-Copyright (c) Isaac Z. Schlueter and Contributors
-
-Permission to use, copy, modify, and/or distribute this software for any
-purpose with or without fee is hereby granted, provided that the above
-copyright notice and this permission notice appear in all copies.
-
-THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
-IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
diff --git a/node_modules/duplexify/node_modules/once/README.md b/node_modules/duplexify/node_modules/once/README.md
deleted file mode 100644
index a2981ea07..000000000
--- a/node_modules/duplexify/node_modules/once/README.md
+++ /dev/null
@@ -1,51 +0,0 @@
-# once
-
-Only call a function once.
-
-## usage
-
-```javascript
-var once = require('once')
-
-function load (file, cb) {
-  cb = once(cb)
-  loader.load('file')
-  loader.once('load', cb)
-  loader.once('error', cb)
-}
-```
-
-Or add to the Function.prototype in a responsible way:
-
-```javascript
-// only has to be done once
-require('once').proto()
-
-function load (file, cb) {
-  cb = cb.once()
-  loader.load('file')
-  loader.once('load', cb)
-  loader.once('error', cb)
-}
-```
-
-Ironically, the prototype feature makes this module twice as
-complicated as necessary.
-
-To check whether you function has been called, use `fn.called`. Once the
-function is called for the first time the return value of the original
-function is saved in `fn.value` and subsequent calls will continue to
-return this value.
-
-```javascript
-var once = require('once')
-
-function load (cb) {
-  cb = once(cb)
-  var stream = createStream()
-  stream.once('data', cb)
-  stream.once('end', function () {
-    if (!cb.called) cb(new Error('not found'))
-  })
-}
-```
diff --git a/node_modules/duplexify/node_modules/once/once.js b/node_modules/duplexify/node_modules/once/once.js
deleted file mode 100644
index 2e1e721bf..000000000
--- a/node_modules/duplexify/node_modules/once/once.js
+++ /dev/null
@@ -1,21 +0,0 @@
-var wrappy = require('wrappy')
-module.exports = wrappy(once)
-
-once.proto = once(function () {
-  Object.defineProperty(Function.prototype, 'once', {
-    value: function () {
-      return once(this)
-    },
-    configurable: true
-  })
-})
-
-function once (fn) {
-  var f = function () {
-    if (f.called) return f.value
-    f.called = true
-    return f.value = fn.apply(this, arguments)
-  }
-  f.called = false
-  return f
-}
diff --git a/node_modules/duplexify/node_modules/once/package.json b/node_modules/duplexify/node_modules/once/package.json
deleted file mode 100644
index 28fe2ff72..000000000
--- a/node_modules/duplexify/node_modules/once/package.json
+++ /dev/null
@@ -1,33 +0,0 @@
-{
-  "name": "once",
-  "version": "1.3.3",
-  "description": "Run a function exactly one time",
-  "main": "once.js",
-  "directories": {
-    "test": "test"
-  },
-  "dependencies": {
-    "wrappy": "1"
-  },
-  "devDependencies": {
-    "tap": "^1.2.0"
-  },
-  "scripts": {
-    "test": "tap test/*.js"
-  },
-  "files": [
-    "once.js"
-  ],
-  "repository": {
-    "type": "git",
-    "url": "git://github.com/isaacs/once"
-  },
-  "keywords": [
-    "once",
-    "function",
-    "one",
-    "single"
-  ],
-  "author": "Isaac Z. Schlueter <i@izs.me> (http://blog.izs.me/)",
-  "license": "ISC"
-}
diff --git a/node_modules/end-of-stream/index.js b/node_modules/end-of-stream/index.js
index b9fbec071..9f61ed5af 100644
--- a/node_modules/end-of-stream/index.js
+++ b/node_modules/end-of-stream/index.js
@@ -55,7 +55,18 @@ var eos = function(stream, opts, callback) {
 	if (opts.error !== false) stream.on('error', callback);
 	stream.on('close', onclose);
 
-	return stream;
+	return function() {
+		stream.removeListener('complete', onfinish);
+		stream.removeListener('abort', onclose);
+		stream.removeListener('request', onrequest);
+		if (stream.req) stream.req.removeListener('finish', onfinish);
+		stream.removeListener('end', onlegacyfinish);
+		stream.removeListener('close', onlegacyfinish);
+		stream.removeListener('finish', onfinish);
+		stream.removeListener('end', onend);
+		stream.removeListener('error', callback);
+		stream.removeListener('close', onclose);
+	};
 };
 
 module.exports = eos;
\ No newline at end of file
diff --git a/node_modules/end-of-stream/package.json b/node_modules/end-of-stream/package.json
index 1f64886ac..5e36241b5 100644
--- a/node_modules/end-of-stream/package.json
+++ b/node_modules/end-of-stream/package.json
@@ -1,6 +1,6 @@
 {
   "name": "end-of-stream",
-  "version": "0.1.5",
+  "version": "1.0.0",
   "description": "Call a callback when a readable/writable/duplex stream has completed or failed.",
   "repository": {
     "type": "git",
diff --git a/node_modules/end-of-stream/test.js b/node_modules/end-of-stream/test.js
index 277f1ce61..d4d126fe5 100644
--- a/node_modules/end-of-stream/test.js
+++ b/node_modules/end-of-stream/test.js
@@ -29,6 +29,12 @@ eos(rs, function(err) {
 });
 rs.pipe(fs.createWriteStream('/dev/null'));
 
+var rs = fs.createReadStream(__filename);
+eos(rs, function(err) {
+	throw new Error('no go')
+})();
+rs.pipe(fs.createWriteStream('/dev/null'));
+
 var socket = net.connect(50000);
 eos(socket, function(err) {
 	expected--;
@@ -36,7 +42,6 @@ eos(socket, function(err) {
 	if (!expected) process.exit(0);
 });
 
-
 var server = net.createServer(function(socket) {
 	eos(socket, function() {
 		expected--;
@@ -51,8 +56,6 @@ var server = net.createServer(function(socket) {
 	});
 });
 
-
-
 setTimeout(function() {
 	assert(expected === 0);
 	process.exit(0);
diff --git a/node_modules/gulp-util/node_modules/escape-string-regexp/index.js b/node_modules/gulp-util/node_modules/escape-string-regexp/index.js
deleted file mode 100644
index 7834bf9b2..000000000
--- a/node_modules/gulp-util/node_modules/escape-string-regexp/index.js
+++ /dev/null
@@ -1,11 +0,0 @@
-'use strict';
-
-var matchOperatorsRe = /[|\\{}()[\]^$+*?.]/g;
-
-module.exports = function (str) {
-	if (typeof str !== 'string') {
-		throw new TypeError('Expected a string');
-	}
-
-	return str.replace(matchOperatorsRe, '\\$&');
-};
diff --git a/node_modules/gulp-util/node_modules/escape-string-regexp/license b/node_modules/gulp-util/node_modules/escape-string-regexp/license
deleted file mode 100644
index 654d0bfe9..000000000
--- a/node_modules/gulp-util/node_modules/escape-string-regexp/license
+++ /dev/null
@@ -1,21 +0,0 @@
-The MIT License (MIT)
-
-Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (sindresorhus.com)
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
diff --git a/node_modules/gulp-util/node_modules/escape-string-regexp/package.json b/node_modules/gulp-util/node_modules/escape-string-regexp/package.json
deleted file mode 100644
index f307df34a..000000000
--- a/node_modules/gulp-util/node_modules/escape-string-regexp/package.json
+++ /dev/null
@@ -1,41 +0,0 @@
-{
-  "name": "escape-string-regexp",
-  "version": "1.0.5",
-  "description": "Escape RegExp special characters",
-  "license": "MIT",
-  "repository": "sindresorhus/escape-string-regexp",
-  "author": {
-    "name": "Sindre Sorhus",
-    "email": "sindresorhus@gmail.com",
-    "url": "sindresorhus.com"
-  },
-  "maintainers": [
-    "Sindre Sorhus <sindresorhus@gmail.com> (sindresorhus.com)",
-    "Joshua Boy Nicolai Appelman <joshua@jbna.nl> (jbna.nl)"
-  ],
-  "engines": {
-    "node": ">=0.8.0"
-  },
-  "scripts": {
-    "test": "xo && ava"
-  },
-  "files": [
-    "index.js"
-  ],
-  "keywords": [
-    "escape",
-    "regex",
-    "regexp",
-    "re",
-    "regular",
-    "expression",
-    "string",
-    "str",
-    "special",
-    "characters"
-  ],
-  "devDependencies": {
-    "ava": "*",
-    "xo": "*"
-  }
-}
diff --git a/node_modules/gulp-util/node_modules/escape-string-regexp/readme.md b/node_modules/gulp-util/node_modules/escape-string-regexp/readme.md
deleted file mode 100644
index 87ac82d5e..000000000
--- a/node_modules/gulp-util/node_modules/escape-string-regexp/readme.md
+++ /dev/null
@@ -1,27 +0,0 @@
-# escape-string-regexp [![Build Status](https://travis-ci.org/sindresorhus/escape-string-regexp.svg?branch=master)](https://travis-ci.org/sindresorhus/escape-string-regexp)
-
-> Escape RegExp special characters
-
-
-## Install
-
-```
-$ npm install --save escape-string-regexp
-```
-
-
-## Usage
-
-```js
-const escapeStringRegexp = require('escape-string-regexp');
-
-const escapedString = escapeStringRegexp('how much $ for a unicorn?');
-//=> 'how much \$ for a unicorn\?'
-
-new RegExp(escapedString);
-```
-
-
-## License
-
-MIT © [Sindre Sorhus](http://sindresorhus.com)
diff --git a/node_modules/gulp/node_modules/readable-stream/node_modules/isarray/README.md b/node_modules/gulp/node_modules/readable-stream/node_modules/isarray/README.md
deleted file mode 100644
index 052a62b8d..000000000
--- a/node_modules/gulp/node_modules/readable-stream/node_modules/isarray/README.md
+++ /dev/null
@@ -1,54 +0,0 @@
-
-# isarray
-
-`Array#isArray` for older browsers.
-
-## Usage
-
-```js
-var isArray = require('isarray');
-
-console.log(isArray([])); // => true
-console.log(isArray({})); // => false
-```
-
-## Installation
-
-With [npm](http://npmjs.org) do
-
-```bash
-$ npm install isarray
-```
-
-Then bundle for the browser with
-[browserify](https://github.com/substack/browserify).
-
-With [component](http://component.io) do
-
-```bash
-$ component install juliangruber/isarray
-```
-
-## License
-
-(MIT)
-
-Copyright (c) 2013 Julian Gruber &lt;julian@juliangruber.com&gt;
-
-Permission is hereby granted, free of charge, to any person obtaining a copy of
-this software and associated documentation files (the "Software"), to deal in
-the Software without restriction, including without limitation the rights to
-use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
-of the Software, and to permit persons to whom the Software is furnished to do
-so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
diff --git a/node_modules/gulp/node_modules/readable-stream/node_modules/isarray/build/build.js b/node_modules/gulp/node_modules/readable-stream/node_modules/isarray/build/build.js
deleted file mode 100644
index ec58596ae..000000000
--- a/node_modules/gulp/node_modules/readable-stream/node_modules/isarray/build/build.js
+++ /dev/null
@@ -1,209 +0,0 @@
-
-/**
- * Require the given path.
- *
- * @param {String} path
- * @return {Object} exports
- * @api public
- */
-
-function require(path, parent, orig) {
-  var resolved = require.resolve(path);
-
-  // lookup failed
-  if (null == resolved) {
-    orig = orig || path;
-    parent = parent || 'root';
-    var err = new Error('Failed to require "' + orig + '" from "' + parent + '"');
-    err.path = orig;
-    err.parent = parent;
-    err.require = true;
-    throw err;
-  }
-
-  var module = require.modules[resolved];
-
-  // perform real require()
-  // by invoking the module's
-  // registered function
-  if (!module.exports) {
-    module.exports = {};
-    module.client = module.component = true;
-    module.call(this, module.exports, require.relative(resolved), module);
-  }
-
-  return module.exports;
-}
-
-/**
- * Registered modules.
- */
-
-require.modules = {};
-
-/**
- * Registered aliases.
- */
-
-require.aliases = {};
-
-/**
- * Resolve `path`.
- *
- * Lookup:
- *
- *   - PATH/index.js
- *   - PATH.js
- *   - PATH
- *
- * @param {String} path
- * @return {String} path or null
- * @api private
- */
-
-require.resolve = function(path) {
-  if (path.charAt(0) === '/') path = path.slice(1);
-  var index = path + '/index.js';
-
-  var paths = [
-    path,
-    path + '.js',
-    path + '.json',
-    path + '/index.js',
-    path + '/index.json'
-  ];
-
-  for (var i = 0; i < paths.length; i++) {
-    var path = paths[i];
-    if (require.modules.hasOwnProperty(path)) return path;
-  }
-
-  if (require.aliases.hasOwnProperty(index)) {
-    return require.aliases[index];
-  }
-};
-
-/**
- * Normalize `path` relative to the current path.
- *
- * @param {String} curr
- * @param {String} path
- * @return {String}
- * @api private
- */
-
-require.normalize = function(curr, path) {
-  var segs = [];
-
-  if ('.' != path.charAt(0)) return path;
-
-  curr = curr.split('/');
-  path = path.split('/');
-
-  for (var i = 0; i < path.length; ++i) {
-    if ('..' == path[i]) {
-      curr.pop();
-    } else if ('.' != path[i] && '' != path[i]) {
-      segs.push(path[i]);
-    }
-  }
-
-  return curr.concat(segs).join('/');
-};
-
-/**
- * Register module at `path` with callback `definition`.
- *
- * @param {String} path
- * @param {Function} definition
- * @api private
- */
-
-require.register = function(path, definition) {
-  require.modules[path] = definition;
-};
-
-/**
- * Alias a module definition.
- *
- * @param {String} from
- * @param {String} to
- * @api private
- */
-
-require.alias = function(from, to) {
-  if (!require.modules.hasOwnProperty(from)) {
-    throw new Error('Failed to alias "' + from + '", it does not exist');
-  }
-  require.aliases[to] = from;
-};
-
-/**
- * Return a require function relative to the `parent` path.
- *
- * @param {String} parent
- * @return {Function}
- * @api private
- */
-
-require.relative = function(parent) {
-  var p = require.normalize(parent, '..');
-
-  /**
-   * lastIndexOf helper.
-   */
-
-  function lastIndexOf(arr, obj) {
-    var i = arr.length;
-    while (i--) {
-      if (arr[i] === obj) return i;
-    }
-    return -1;
-  }
-
-  /**
-   * The relative require() itself.
-   */
-
-  function localRequire(path) {
-    var resolved = localRequire.resolve(path);
-    return require(resolved, parent, path);
-  }
-
-  /**
-   * Resolve relative to the parent.
-   */
-
-  localRequire.resolve = function(path) {
-    var c = path.charAt(0);
-    if ('/' == c) return path.slice(1);
-    if ('.' == c) return require.normalize(p, path);
-
-    // resolve deps by returning
-    // the dep in the nearest "deps"
-    // directory
-    var segs = parent.split('/');
-    var i = lastIndexOf(segs, 'deps') + 1;
-    if (!i) i = 0;
-    path = segs.slice(0, i + 1).join('/') + '/deps/' + path;
-    return path;
-  };
-
-  /**
-   * Check if module is defined at `path`.
-   */
-
-  localRequire.exists = function(path) {
-    return require.modules.hasOwnProperty(localRequire.resolve(path));
-  };
-
-  return localRequire;
-};
-require.register("isarray/index.js", function(exports, require, module){
-module.exports = Array.isArray || function (arr) {
-  return Object.prototype.toString.call(arr) == '[object Array]';
-};
-
-});
-require.alias("isarray/index.js", "isarray/index.js");
-
diff --git a/node_modules/gulp/node_modules/readable-stream/node_modules/isarray/component.json b/node_modules/gulp/node_modules/readable-stream/node_modules/isarray/component.json
deleted file mode 100644
index 9e31b6838..000000000
--- a/node_modules/gulp/node_modules/readable-stream/node_modules/isarray/component.json
+++ /dev/null
@@ -1,19 +0,0 @@
-{
-  "name" : "isarray",
-  "description" : "Array#isArray for older browsers",
-  "version" : "0.0.1",
-  "repository" : "juliangruber/isarray",
-  "homepage": "https://github.com/juliangruber/isarray",
-  "main" : "index.js",
-  "scripts" : [
-    "index.js"
-  ],
-  "dependencies" : {},
-  "keywords": ["browser","isarray","array"],
-  "author": {
-    "name": "Julian Gruber",
-    "email": "mail@juliangruber.com",
-    "url": "http://juliangruber.com"
-  },
-  "license": "MIT"
-}
diff --git a/node_modules/gulp/node_modules/readable-stream/node_modules/isarray/index.js b/node_modules/gulp/node_modules/readable-stream/node_modules/isarray/index.js
deleted file mode 100644
index 5f5ad45d4..000000000
--- a/node_modules/gulp/node_modules/readable-stream/node_modules/isarray/index.js
+++ /dev/null
@@ -1,3 +0,0 @@
-module.exports = Array.isArray || function (arr) {
-  return Object.prototype.toString.call(arr) == '[object Array]';
-};
diff --git a/node_modules/gulp/node_modules/readable-stream/node_modules/isarray/package.json b/node_modules/gulp/node_modules/readable-stream/node_modules/isarray/package.json
deleted file mode 100644
index 5a1e9c109..000000000
--- a/node_modules/gulp/node_modules/readable-stream/node_modules/isarray/package.json
+++ /dev/null
@@ -1,25 +0,0 @@
-{
-  "name" : "isarray",
-  "description" : "Array#isArray for older browsers",
-  "version" : "0.0.1",
-  "repository" : {
-    "type" : "git",
-    "url" : "git://github.com/juliangruber/isarray.git"
-  },
-  "homepage": "https://github.com/juliangruber/isarray",
-  "main" : "index.js",
-  "scripts" : {
-    "test" : "tap test/*.js"
-  },
-  "dependencies" : {},
-  "devDependencies" : {
-    "tap" : "*"
-  },
-  "keywords": ["browser","isarray","array"],
-  "author": {
-    "name": "Julian Gruber",
-    "email": "mail@juliangruber.com",
-    "url": "http://juliangruber.com"
-  },
-  "license": "MIT"
-}
diff --git a/node_modules/mocha/node_modules/.bin/supports-color b/node_modules/mocha/node_modules/.bin/supports-color
index af0f05efe..886732fac 120000
--- a/node_modules/mocha/node_modules/.bin/supports-color
+++ b/node_modules/mocha/node_modules/.bin/supports-color
@@ -1 +1 @@
-../supports-color/cli.js
\ No newline at end of file
+../../../supports-color/cli.js
\ No newline at end of file
diff --git a/node_modules/readable-stream/.npmignore b/node_modules/readable-stream/.npmignore
index 6d270c6cc..38344f87a 100644
--- a/node_modules/readable-stream/.npmignore
+++ b/node_modules/readable-stream/.npmignore
@@ -2,8 +2,4 @@ build/
 test/
 examples/
 fs.js
-zlib.js
-.zuul.yml
-.nyc_output
-coverage
-docs/
+zlib.js
\ No newline at end of file
diff --git a/node_modules/readable-stream/.travis.yml b/node_modules/readable-stream/.travis.yml
index 84504c98f..1b8211846 100644
--- a/node_modules/readable-stream/.travis.yml
+++ b/node_modules/readable-stream/.travis.yml
@@ -7,6 +7,9 @@ notifications:
   email: false
 matrix:
   fast_finish: true
+  allow_failures:
+    - env: TASK=browser BROWSER_NAME=ipad BROWSER_VERSION="6.0..latest"
+    - env: TASK=browser BROWSER_NAME=iphone BROWSER_VERSION="6.0..latest"
   include:
   - node_js: '0.8'
     env: TASK=test
@@ -26,8 +29,6 @@ matrix:
     env: TASK=test
   - node_js: 5
     env: TASK=test
-  - node_js: 6
-    env: TASK=test
   - node_js: 5
     env: TASK=browser BROWSER_NAME=android BROWSER_VERSION="4.0..latest"
   - node_js: 5
@@ -39,9 +40,11 @@ matrix:
   - node_js: 5
     env: TASK=browser BROWSER_NAME=firefox BROWSER_VERSION="-3..latest"
   - node_js: 5
-    env: TASK=browser BROWSER_NAME=safari BROWSER_VERSION="5..latest"
+    env: TASK=browser BROWSER_NAME=ipad BROWSER_VERSION="6.0..latest"
   - node_js: 5
-    env: TASK=browser BROWSER_NAME=microsoftedge BROWSER_VERSION=latest
+    env: TASK=browser BROWSER_NAME=iphone BROWSER_VERSION="6.0..latest"
+  - node_js: 5
+    env: TASK=browser BROWSER_NAME=safari BROWSER_VERSION="5..latest"
 script: "npm run $TASK"
 env:
   global:
diff --git a/node_modules/readable-stream/README.md b/node_modules/readable-stream/README.md
index 9be2adb15..86b95a3bf 100644
--- a/node_modules/readable-stream/README.md
+++ b/node_modules/readable-stream/README.md
@@ -1,6 +1,6 @@
 # readable-stream
 
-***Node-core v7.0.0 streams for userland*** [![Build Status](https://travis-ci.org/nodejs/readable-stream.svg?branch=master)](https://travis-ci.org/nodejs/readable-stream)
+***Node-core v5.8.0 streams for userland*** [![Build Status](https://travis-ci.org/nodejs/readable-stream.svg?branch=master)](https://travis-ci.org/nodejs/readable-stream)
 
 
 [![NPM](https://nodei.co/npm/readable-stream.png?downloads=true&downloadRank=true)](https://nodei.co/npm/readable-stream/)
@@ -16,9 +16,7 @@ npm install --save readable-stream
 ***Node-core streams for userland***
 
 This package is a mirror of the Streams2 and Streams3 implementations in
-Node-core.
-
-Full documentation may be found on the [Node.js website](https://nodejs.org/dist/v7.1.0/docs/api/).
+Node-core, including [documentation](doc/stream.markdown).
 
 If you want to guarantee a stable streams base, regardless of what version of
 Node you, or the users of your libraries are using, use **readable-stream** *only* and avoid the *"stream"* module in Node-core, for background see [this blogpost](http://r.va.gg/2014/06/why-i-dont-use-nodes-core-stream-module.html).
@@ -36,5 +34,3 @@ As of version 2.0.0 **readable-stream** uses semantic versioning.
 * **Sam Newman** ([@sonewman](https://github.com/sonewman)) &lt;newmansam@outlook.com&gt;
 * **Mathias Buus** ([@mafintosh](https://github.com/mafintosh)) &lt;mathiasbuus@gmail.com&gt;
 * **Domenic Denicola** ([@domenic](https://github.com/domenic)) &lt;d@domenic.me&gt;
-* **Matteo Collina** ([@mcollina](https://github.com/mcollina)) &lt;matteo.collina@gmail.com&gt;
-  - Release GPG key: 3ABC01543F22DD2239285CDD818674489FBC127E
diff --git a/node_modules/readable-stream/lib/_stream_readable.js b/node_modules/readable-stream/lib/_stream_readable.js
index 3a7d42d62..54a9d5c55 100644
--- a/node_modules/readable-stream/lib/_stream_readable.js
+++ b/node_modules/readable-stream/lib/_stream_readable.js
@@ -11,14 +11,14 @@ var isArray = require('isarray');
 /*</replacement>*/
 
 /*<replacement>*/
-var Duplex;
+var Buffer = require('buffer').Buffer;
 /*</replacement>*/
 
 Readable.ReadableState = ReadableState;
 
-/*<replacement>*/
-var EE = require('events').EventEmitter;
+var EE = require('events');
 
+/*<replacement>*/
 var EElistenerCount = function (emitter, type) {
   return emitter.listeners(type).length;
 };
@@ -36,9 +36,6 @@ var Stream;
 /*</replacement>*/
 
 var Buffer = require('buffer').Buffer;
-/*<replacement>*/
-var bufferShim = require('buffer-shims');
-/*</replacement>*/
 
 /*<replacement>*/
 var util = require('core-util-is');
@@ -47,7 +44,7 @@ util.inherits = require('inherits');
 
 /*<replacement>*/
 var debugUtil = require('util');
-var debug = void 0;
+var debug = undefined;
 if (debugUtil && debugUtil.debuglog) {
   debug = debugUtil.debuglog('stream');
 } else {
@@ -55,25 +52,11 @@ if (debugUtil && debugUtil.debuglog) {
 }
 /*</replacement>*/
 
-var BufferList = require('./internal/streams/BufferList');
 var StringDecoder;
 
 util.inherits(Readable, Stream);
 
-function prependListener(emitter, event, fn) {
-  // Sadly this is not cacheable as some libraries bundle their own
-  // event emitter implementation with them.
-  if (typeof emitter.prependListener === 'function') {
-    return emitter.prependListener(event, fn);
-  } else {
-    // This is a hack to make sure that our error handler is attached before any
-    // userland ones.  NEVER DO THIS. This is here only because this code needs
-    // to continue to work with older versions of Node.js that do not include
-    // the prependListener() method. The goal is to eventually remove this hack.
-    if (!emitter._events || !emitter._events[event]) emitter.on(event, fn);else if (isArray(emitter._events[event])) emitter._events[event].unshift(fn);else emitter._events[event] = [fn, emitter._events[event]];
-  }
-}
-
+var Duplex;
 function ReadableState(options, stream) {
   Duplex = Duplex || require('./_stream_duplex');
 
@@ -94,10 +77,7 @@ function ReadableState(options, stream) {
   // cast to ints.
   this.highWaterMark = ~ ~this.highWaterMark;
 
-  // A linked list is used to store data chunks instead of an array because the
-  // linked list can remove elements from the beginning faster than
-  // array.shift()
-  this.buffer = new BufferList();
+  this.buffer = [];
   this.length = 0;
   this.pipes = null;
   this.pipesCount = 0;
@@ -143,6 +123,7 @@ function ReadableState(options, stream) {
   }
 }
 
+var Duplex;
 function Readable(options) {
   Duplex = Duplex || require('./_stream_duplex');
 
@@ -168,7 +149,7 @@ Readable.prototype.push = function (chunk, encoding) {
   if (!state.objectMode && typeof chunk === 'string') {
     encoding = encoding || state.defaultEncoding;
     if (encoding !== state.encoding) {
-      chunk = bufferShim.from(chunk, encoding);
+      chunk = new Buffer(chunk, encoding);
       encoding = '';
     }
   }
@@ -198,8 +179,8 @@ function readableAddChunk(stream, state, chunk, encoding, addToFront) {
       var e = new Error('stream.push() after EOF');
       stream.emit('error', e);
     } else if (state.endEmitted && addToFront) {
-      var _e = new Error('stream.unshift() after end event');
-      stream.emit('error', _e);
+      var e = new Error('stream.unshift() after end event');
+      stream.emit('error', e);
     } else {
       var skipAdd;
       if (state.decoder && !addToFront && !encoding) {
@@ -259,8 +240,7 @@ function computeNewHighWaterMark(n) {
   if (n >= MAX_HWM) {
     n = MAX_HWM;
   } else {
-    // Get the next highest power of 2 to prevent increasing hwm excessively in
-    // tiny amounts
+    // Get the next highest power of 2
     n--;
     n |= n >>> 1;
     n |= n >>> 2;
@@ -272,34 +252,44 @@ function computeNewHighWaterMark(n) {
   return n;
 }
 
-// This function is designed to be inlinable, so please take care when making
-// changes to the function body.
 function howMuchToRead(n, state) {
-  if (n <= 0 || state.length === 0 && state.ended) return 0;
-  if (state.objectMode) return 1;
-  if (n !== n) {
-    // Only flow one buffer at a time
-    if (state.flowing && state.length) return state.buffer.head.data.length;else return state.length;
+  if (state.length === 0 && state.ended) return 0;
+
+  if (state.objectMode) return n === 0 ? 0 : 1;
+
+  if (n === null || isNaN(n)) {
+    // only flow one buffer at a time
+    if (state.flowing && state.buffer.length) return state.buffer[0].length;else return state.length;
   }
-  // If we're asking for more than the current hwm, then raise the hwm.
+
+  if (n <= 0) return 0;
+
+  // If we're asking for more than the target buffer level,
+  // then raise the water mark.  Bump up to the next highest
+  // power of 2, to prevent increasing it excessively in tiny
+  // amounts.
   if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n);
-  if (n <= state.length) return n;
-  // Don't have enough
-  if (!state.ended) {
-    state.needReadable = true;
-    return 0;
+
+  // don't have that much.  return null, unless we've ended.
+  if (n > state.length) {
+    if (!state.ended) {
+      state.needReadable = true;
+      return 0;
+    } else {
+      return state.length;
+    }
   }
-  return state.length;
+
+  return n;
 }
 
 // you can override either this method, or the async _read(n) below.
 Readable.prototype.read = function (n) {
   debug('read', n);
-  n = parseInt(n, 10);
   var state = this._readableState;
   var nOrig = n;
 
-  if (n !== 0) state.emittedReadable = false;
+  if (typeof n !== 'number' || n > 0) state.emittedReadable = false;
 
   // if we're doing read(0) to trigger a readable event, but we
   // already have a bunch of data in the buffer, then just trigger
@@ -355,7 +345,9 @@ Readable.prototype.read = function (n) {
   if (state.ended || state.reading) {
     doRead = false;
     debug('reading or ended', doRead);
-  } else if (doRead) {
+  }
+
+  if (doRead) {
     debug('do read');
     state.reading = true;
     state.sync = true;
@@ -364,29 +356,28 @@ Readable.prototype.read = function (n) {
     // call internal read method
     this._read(state.highWaterMark);
     state.sync = false;
-    // If _read pushed data synchronously, then `reading` will be false,
-    // and we need to re-evaluate how much data we can return to the user.
-    if (!state.reading) n = howMuchToRead(nOrig, state);
   }
 
+  // If _read pushed data synchronously, then `reading` will be false,
+  // and we need to re-evaluate how much data we can return to the user.
+  if (doRead && !state.reading) n = howMuchToRead(nOrig, state);
+
   var ret;
   if (n > 0) ret = fromList(n, state);else ret = null;
 
   if (ret === null) {
     state.needReadable = true;
     n = 0;
-  } else {
-    state.length -= n;
   }
 
-  if (state.length === 0) {
-    // If we have nothing in the buffer, then we want to know
-    // as soon as we *do* get something into the buffer.
-    if (!state.ended) state.needReadable = true;
+  state.length -= n;
 
-    // If we tried to read() past the EOF, then emit end on the next tick.
-    if (nOrig !== n && state.ended) endReadable(this);
-  }
+  // If we have nothing in the buffer, then we want to know
+  // as soon as we *do* get something into the buffer.
+  if (state.length === 0 && !state.ended) state.needReadable = true;
+
+  // If we tried to read() past the EOF, then emit end on the next tick.
+  if (nOrig !== n && state.ended && state.length === 0) endReadable(this);
 
   if (ret !== null) this.emit('data', ret);
 
@@ -465,7 +456,7 @@ function maybeReadMore_(stream, state) {
 // for virtual (non-string, non-buffer) streams, "length" is somewhat
 // arbitrary, and perhaps not very meaningful.
 Readable.prototype._read = function (n) {
-  this.emit('error', new Error('_read() is not implemented'));
+  this.emit('error', new Error('not implemented'));
 };
 
 Readable.prototype.pipe = function (dest, pipeOpts) {
@@ -534,25 +525,17 @@ Readable.prototype.pipe = function (dest, pipeOpts) {
     if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain();
   }
 
-  // If the user pushes more data while we're writing to dest then we'll end up
-  // in ondata again. However, we only want to increase awaitDrain once because
-  // dest will only emit one 'drain' event for the multiple writes.
-  // => Introduce a guard on increasing awaitDrain.
-  var increasedAwaitDrain = false;
   src.on('data', ondata);
   function ondata(chunk) {
     debug('ondata');
-    increasedAwaitDrain = false;
     var ret = dest.write(chunk);
-    if (false === ret && !increasedAwaitDrain) {
+    if (false === ret) {
       // If the user unpiped during `dest.write()`, it is possible
       // to get stuck in a permanently paused state if that write
       // also returned false.
-      // => Check whether `dest` is still a piping destination.
-      if ((state.pipesCount === 1 && state.pipes === dest || state.pipesCount > 1 && indexOf(state.pipes, dest) !== -1) && !cleanedUp) {
+      if (state.pipesCount === 1 && state.pipes[0] === dest && src.listenerCount('data') === 1 && !cleanedUp) {
         debug('false write response, pause', src._readableState.awaitDrain);
         src._readableState.awaitDrain++;
-        increasedAwaitDrain = true;
       }
       src.pause();
     }
@@ -566,9 +549,9 @@ Readable.prototype.pipe = function (dest, pipeOpts) {
     dest.removeListener('error', onerror);
     if (EElistenerCount(dest, 'error') === 0) dest.emit('error', er);
   }
-
-  // Make sure our error handler is attached before userland ones.
-  prependListener(dest, 'error', onerror);
+  // This is a brutally ugly hack to make sure that our error handler
+  // is attached before any userland ones.  NEVER DO THIS.
+  if (!dest._events || !dest._events.error) dest.on('error', onerror);else if (isArray(dest._events.error)) dest._events.error.unshift(onerror);else dest._events.error = [onerror, dest._events.error];
 
   // Both close and finish should trigger unpipe, but only once.
   function onclose() {
@@ -643,16 +626,16 @@ Readable.prototype.unpipe = function (dest) {
     state.pipesCount = 0;
     state.flowing = false;
 
-    for (var i = 0; i < len; i++) {
-      dests[i].emit('unpipe', this);
+    for (var _i = 0; _i < len; _i++) {
+      dests[_i].emit('unpipe', this);
     }return this;
   }
 
   // try to find the right one.
-  var index = indexOf(state.pipes, dest);
-  if (index === -1) return this;
+  var i = indexOf(state.pipes, dest);
+  if (i === -1) return this;
 
-  state.pipes.splice(index, 1);
+  state.pipes.splice(i, 1);
   state.pipesCount -= 1;
   if (state.pipesCount === 1) state.pipes = state.pipes[0];
 
@@ -666,14 +649,18 @@ Readable.prototype.unpipe = function (dest) {
 Readable.prototype.on = function (ev, fn) {
   var res = Stream.prototype.on.call(this, ev, fn);
 
-  if (ev === 'data') {
-    // Start flowing on next tick if stream isn't explicitly paused
-    if (this._readableState.flowing !== false) this.resume();
-  } else if (ev === 'readable') {
+  // If listening to data, and it has not explicitly been paused,
+  // then call resume to start the flow of data on the next tick.
+  if (ev === 'data' && false !== this._readableState.flowing) {
+    this.resume();
+  }
+
+  if (ev === 'readable' && !this._readableState.endEmitted) {
     var state = this._readableState;
-    if (!state.endEmitted && !state.readableListening) {
-      state.readableListening = state.needReadable = true;
+    if (!state.readableListening) {
+      state.readableListening = true;
       state.emittedReadable = false;
+      state.needReadable = true;
       if (!state.reading) {
         processNextTick(nReadingNextTick, this);
       } else if (state.length) {
@@ -717,7 +704,6 @@ function resume_(stream, state) {
   }
 
   state.resumeScheduled = false;
-  state.awaitDrain = 0;
   stream.emit('resume');
   flow(stream);
   if (state.flowing && !state.reading) stream.read(0);
@@ -736,7 +722,11 @@ Readable.prototype.pause = function () {
 function flow(stream) {
   var state = stream._readableState;
   debug('flow', state.flowing);
-  while (state.flowing && stream.read() !== null) {}
+  if (state.flowing) {
+    do {
+      var chunk = stream.read();
+    } while (null !== chunk && state.flowing);
+  }
 }
 
 // wrap an old-style stream as the async data source.
@@ -807,101 +797,50 @@ Readable._fromList = fromList;
 
 // Pluck off n bytes from an array of buffers.
 // Length is the combined lengths of all the buffers in the list.
-// This function is designed to be inlinable, so please take care when making
-// changes to the function body.
 function fromList(n, state) {
-  // nothing buffered
-  if (state.length === 0) return null;
-
+  var list = state.buffer;
+  var length = state.length;
+  var stringMode = !!state.decoder;
+  var objectMode = !!state.objectMode;
   var ret;
-  if (state.objectMode) ret = state.buffer.shift();else if (!n || n >= state.length) {
-    // read it all, truncate the list
-    if (state.decoder) ret = state.buffer.join('');else if (state.buffer.length === 1) ret = state.buffer.head.data;else ret = state.buffer.concat(state.length);
-    state.buffer.clear();
-  } else {
-    // read part of list
-    ret = fromListPartial(n, state.buffer, state.decoder);
-  }
 
-  return ret;
-}
+  // nothing in the list, definitely empty.
+  if (list.length === 0) return null;
 
-// Extracts only enough buffered data to satisfy the amount requested.
-// This function is designed to be inlinable, so please take care when making
-// changes to the function body.
-function fromListPartial(n, list, hasStrings) {
-  var ret;
-  if (n < list.head.data.length) {
-    // slice is the same for buffers and strings
-    ret = list.head.data.slice(0, n);
-    list.head.data = list.head.data.slice(n);
-  } else if (n === list.head.data.length) {
-    // first chunk is a perfect match
-    ret = list.shift();
+  if (length === 0) ret = null;else if (objectMode) ret = list.shift();else if (!n || n >= length) {
+    // read it all, truncate the array.
+    if (stringMode) ret = list.join('');else if (list.length === 1) ret = list[0];else ret = Buffer.concat(list, length);
+    list.length = 0;
   } else {
-    // result spans more than one buffer
-    ret = hasStrings ? copyFromBufferString(n, list) : copyFromBuffer(n, list);
-  }
-  return ret;
-}
+    // read just some of it.
+    if (n < list[0].length) {
+      // just take a part of the first list item.
+      // slice is the same for buffers and strings.
+      var buf = list[0];
+      ret = buf.slice(0, n);
+      list[0] = buf.slice(n);
+    } else if (n === list[0].length) {
+      // first list is a perfect match
+      ret = list.shift();
+    } else {
+      // complex case.
+      // we have enough to cover it, but it spans past the first buffer.
+      if (stringMode) ret = '';else ret = new Buffer(n);
 
-// Copies a specified amount of characters from the list of buffered data
-// chunks.
-// This function is designed to be inlinable, so please take care when making
-// changes to the function body.
-function copyFromBufferString(n, list) {
-  var p = list.head;
-  var c = 1;
-  var ret = p.data;
-  n -= ret.length;
-  while (p = p.next) {
-    var str = p.data;
-    var nb = n > str.length ? str.length : n;
-    if (nb === str.length) ret += str;else ret += str.slice(0, n);
-    n -= nb;
-    if (n === 0) {
-      if (nb === str.length) {
-        ++c;
-        if (p.next) list.head = p.next;else list.head = list.tail = null;
-      } else {
-        list.head = p;
-        p.data = str.slice(nb);
-      }
-      break;
-    }
-    ++c;
-  }
-  list.length -= c;
-  return ret;
-}
+      var c = 0;
+      for (var i = 0, l = list.length; i < l && c < n; i++) {
+        var buf = list[0];
+        var cpy = Math.min(n - c, buf.length);
+
+        if (stringMode) ret += buf.slice(0, cpy);else buf.copy(ret, c, 0, cpy);
 
-// Copies a specified amount of bytes from the list of buffered data chunks.
-// This function is designed to be inlinable, so please take care when making
-// changes to the function body.
-function copyFromBuffer(n, list) {
-  var ret = bufferShim.allocUnsafe(n);
-  var p = list.head;
-  var c = 1;
-  p.data.copy(ret);
-  n -= p.data.length;
-  while (p = p.next) {
-    var buf = p.data;
-    var nb = n > buf.length ? buf.length : n;
-    buf.copy(ret, ret.length - n, 0, nb);
-    n -= nb;
-    if (n === 0) {
-      if (nb === buf.length) {
-        ++c;
-        if (p.next) list.head = p.next;else list.head = list.tail = null;
-      } else {
-        list.head = p;
-        p.data = buf.slice(nb);
+        if (cpy < buf.length) list[0] = buf.slice(cpy);else list.shift();
+
+        c += cpy;
       }
-      break;
     }
-    ++c;
   }
-  list.length -= c;
+
   return ret;
 }
 
@@ -910,7 +849,7 @@ function endReadable(stream) {
 
   // If we get here before consuming all the bytes, then that is a
   // bug in node.  Should never happen.
-  if (state.length > 0) throw new Error('"endReadable()" called on non-empty stream');
+  if (state.length > 0) throw new Error('endReadable called on non-empty stream');
 
   if (!state.endEmitted) {
     state.ended = true;
diff --git a/node_modules/readable-stream/lib/_stream_transform.js b/node_modules/readable-stream/lib/_stream_transform.js
index cd2583207..625cdc176 100644
--- a/node_modules/readable-stream/lib/_stream_transform.js
+++ b/node_modules/readable-stream/lib/_stream_transform.js
@@ -94,6 +94,7 @@ function Transform(options) {
 
   this._transformState = new TransformState(this);
 
+  // when the writable side finishes, then flush out anything remaining.
   var stream = this;
 
   // start out asking for a readable event once data is transformed.
@@ -110,10 +111,9 @@ function Transform(options) {
     if (typeof options.flush === 'function') this._flush = options.flush;
   }
 
-  // When the writable side finishes, then flush out anything remaining.
   this.once('prefinish', function () {
-    if (typeof this._flush === 'function') this._flush(function (er, data) {
-      done(stream, er, data);
+    if (typeof this._flush === 'function') this._flush(function (er) {
+      done(stream, er);
     });else done(stream);
   });
 }
@@ -134,7 +134,7 @@ Transform.prototype.push = function (chunk, encoding) {
 // an error, then that'll put the hurt on the whole operation.  If you
 // never call cb(), then you'll never get another chunk.
 Transform.prototype._transform = function (chunk, encoding, cb) {
-  throw new Error('_transform() is not implemented');
+  throw new Error('not implemented');
 };
 
 Transform.prototype._write = function (chunk, encoding, cb) {
@@ -164,19 +164,17 @@ Transform.prototype._read = function (n) {
   }
 };
 
-function done(stream, er, data) {
+function done(stream, er) {
   if (er) return stream.emit('error', er);
 
-  if (data !== null && data !== undefined) stream.push(data);
-
   // if there's nothing in the write buffer, then that means
   // that nothing more will ever be provided
   var ws = stream._writableState;
   var ts = stream._transformState;
 
-  if (ws.length) throw new Error('Calling transform done when ws.length != 0');
+  if (ws.length) throw new Error('calling transform done when ws.length != 0');
 
-  if (ts.transforming) throw new Error('Calling transform done when still transforming');
+  if (ts.transforming) throw new Error('calling transform done when still transforming');
 
   return stream.push(null);
 }
\ No newline at end of file
diff --git a/node_modules/readable-stream/lib/_stream_writable.js b/node_modules/readable-stream/lib/_stream_writable.js
index 4d9c62ba6..95916c992 100644
--- a/node_modules/readable-stream/lib/_stream_writable.js
+++ b/node_modules/readable-stream/lib/_stream_writable.js
@@ -15,7 +15,7 @@ var asyncWrite = !process.browser && ['v0.10', 'v0.9.'].indexOf(process.version.
 /*</replacement>*/
 
 /*<replacement>*/
-var Duplex;
+var Buffer = require('buffer').Buffer;
 /*</replacement>*/
 
 Writable.WritableState = WritableState;
@@ -43,9 +43,6 @@ var Stream;
 /*</replacement>*/
 
 var Buffer = require('buffer').Buffer;
-/*<replacement>*/
-var bufferShim = require('buffer-shims');
-/*</replacement>*/
 
 util.inherits(Writable, Stream);
 
@@ -58,6 +55,7 @@ function WriteReq(chunk, encoding, cb) {
   this.next = null;
 }
 
+var Duplex;
 function WritableState(options, stream) {
   Duplex = Duplex || require('./_stream_duplex');
 
@@ -79,7 +77,6 @@ function WritableState(options, stream) {
   // cast to ints.
   this.highWaterMark = ~ ~this.highWaterMark;
 
-  // drain event flag.
   this.needDrain = false;
   // at the start of calling end()
   this.ending = false;
@@ -149,12 +146,13 @@ function WritableState(options, stream) {
   // count buffered requests
   this.bufferedRequestCount = 0;
 
-  // allocate the first CorkedRequest, there is always
-  // one allocated and free to use, and we maintain at most two
+  // create the two objects needed to store the corked requests
+  // they are not a linked list, as no new elements are inserted in there
   this.corkedRequestsFree = new CorkedRequest(this);
+  this.corkedRequestsFree.next = new CorkedRequest(this);
 }
 
-WritableState.prototype.getBuffer = function getBuffer() {
+WritableState.prototype.getBuffer = function writableStateGetBuffer() {
   var current = this.bufferedRequest;
   var out = [];
   while (current) {
@@ -174,37 +172,13 @@ WritableState.prototype.getBuffer = function getBuffer() {
   } catch (_) {}
 })();
 
-// Test _writableState for inheritance to account for Duplex streams,
-// whose prototype chain only points to Readable.
-var realHasInstance;
-if (typeof Symbol === 'function' && Symbol.hasInstance && typeof Function.prototype[Symbol.hasInstance] === 'function') {
-  realHasInstance = Function.prototype[Symbol.hasInstance];
-  Object.defineProperty(Writable, Symbol.hasInstance, {
-    value: function (object) {
-      if (realHasInstance.call(this, object)) return true;
-
-      return object && object._writableState instanceof WritableState;
-    }
-  });
-} else {
-  realHasInstance = function (object) {
-    return object instanceof this;
-  };
-}
-
+var Duplex;
 function Writable(options) {
   Duplex = Duplex || require('./_stream_duplex');
 
-  // Writable ctor is applied to Duplexes, too.
-  // `realHasInstance` is necessary because using plain `instanceof`
-  // would return false, as no `_writableState` property is attached.
-
-  // Trying to use the custom `instanceof` for Writable here will also break the
-  // Node.js LazyTransform implementation, which has a non-trivial getter for
-  // `_writableState` that would lead to infinite recursion.
-  if (!realHasInstance.call(Writable, this) && !(this instanceof Duplex)) {
-    return new Writable(options);
-  }
+  // Writable ctor is applied to Duplexes, though they're not
+  // instanceof Writable, they're instanceof Readable.
+  if (!(this instanceof Writable) && !(this instanceof Duplex)) return new Writable(options);
 
   this._writableState = new WritableState(options, this);
 
@@ -222,7 +196,7 @@ function Writable(options) {
 
 // Otherwise people can pipe Writable streams, which is just wrong.
 Writable.prototype.pipe = function () {
-  this.emit('error', new Error('Cannot pipe, not readable'));
+  this.emit('error', new Error('Cannot pipe. Not readable.'));
 };
 
 function writeAfterEnd(stream, cb) {
@@ -239,16 +213,9 @@ function writeAfterEnd(stream, cb) {
 // how many bytes or characters.
 function validChunk(stream, state, chunk, cb) {
   var valid = true;
-  var er = false;
-  // Always throw error if a null is written
-  // if we are not in object mode then throw
-  // if it is not a buffer, string, or undefined.
-  if (chunk === null) {
-    er = new TypeError('May not write null values to stream');
-  } else if (!Buffer.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {
-    er = new TypeError('Invalid non-string/buffer chunk');
-  }
-  if (er) {
+
+  if (!Buffer.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== null && chunk !== undefined && !state.objectMode) {
+    var er = new TypeError('Invalid non-string/buffer chunk');
     stream.emit('error', er);
     processNextTick(cb, er);
     valid = false;
@@ -298,12 +265,11 @@ Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {
   if (typeof encoding === 'string') encoding = encoding.toLowerCase();
   if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new TypeError('Unknown encoding: ' + encoding);
   this._writableState.defaultEncoding = encoding;
-  return this;
 };
 
 function decodeChunk(state, chunk, encoding) {
   if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {
-    chunk = bufferShim.from(chunk, encoding);
+    chunk = new Buffer(chunk, encoding);
   }
   return chunk;
 }
@@ -426,16 +392,12 @@ function clearBuffer(stream, state) {
 
     doWrite(stream, state, true, state.length, buffer, '', holder.finish);
 
-    // doWrite is almost always async, defer these to save a bit of time
+    // doWrite is always async, defer these to save a bit of time
     // as the hot path ends with doWrite
     state.pendingcb++;
     state.lastBufferedRequest = null;
-    if (holder.next) {
-      state.corkedRequestsFree = holder.next;
-      holder.next = null;
-    } else {
-      state.corkedRequestsFree = new CorkedRequest(state);
-    }
+    state.corkedRequestsFree = holder.next;
+    holder.next = null;
   } else {
     // Slow case, write chunks one-by-one
     while (entry) {
@@ -464,7 +426,7 @@ function clearBuffer(stream, state) {
 }
 
 Writable.prototype._write = function (chunk, encoding, cb) {
-  cb(new Error('_write() is not implemented'));
+  cb(new Error('not implemented'));
 };
 
 Writable.prototype._writev = null;
diff --git a/node_modules/readable-stream/lib/internal/streams/BufferList.js b/node_modules/readable-stream/lib/internal/streams/BufferList.js
deleted file mode 100644
index e4bfcf02d..000000000
--- a/node_modules/readable-stream/lib/internal/streams/BufferList.js
+++ /dev/null
@@ -1,64 +0,0 @@
-'use strict';
-
-var Buffer = require('buffer').Buffer;
-/*<replacement>*/
-var bufferShim = require('buffer-shims');
-/*</replacement>*/
-
-module.exports = BufferList;
-
-function BufferList() {
-  this.head = null;
-  this.tail = null;
-  this.length = 0;
-}
-
-BufferList.prototype.push = function (v) {
-  var entry = { data: v, next: null };
-  if (this.length > 0) this.tail.next = entry;else this.head = entry;
-  this.tail = entry;
-  ++this.length;
-};
-
-BufferList.prototype.unshift = function (v) {
-  var entry = { data: v, next: this.head };
-  if (this.length === 0) this.tail = entry;
-  this.head = entry;
-  ++this.length;
-};
-
-BufferList.prototype.shift = function () {
-  if (this.length === 0) return;
-  var ret = this.head.data;
-  if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next;
-  --this.length;
-  return ret;
-};
-
-BufferList.prototype.clear = function () {
-  this.head = this.tail = null;
-  this.length = 0;
-};
-
-BufferList.prototype.join = function (s) {
-  if (this.length === 0) return '';
-  var p = this.head;
-  var ret = '' + p.data;
-  while (p = p.next) {
-    ret += s + p.data;
-  }return ret;
-};
-
-BufferList.prototype.concat = function (n) {
-  if (this.length === 0) return bufferShim.alloc(0);
-  if (this.length === 1) return this.head.data;
-  var ret = bufferShim.allocUnsafe(n >>> 0);
-  var p = this.head;
-  var i = 0;
-  while (p) {
-    p.data.copy(ret, i);
-    i += p.data.length;
-    p = p.next;
-  }
-  return ret;
-};
\ No newline at end of file
diff --git a/node_modules/readable-stream/package.json b/node_modules/readable-stream/package.json
index cef809cec..d77b090ec 100644
--- a/node_modules/readable-stream/package.json
+++ b/node_modules/readable-stream/package.json
@@ -1,33 +1,25 @@
 {
   "name": "readable-stream",
-  "version": "2.2.2",
+  "version": "2.0.6",
   "description": "Streams3, a user-land copy of the stream library from Node.js",
   "main": "readable.js",
   "dependencies": {
-    "buffer-shims": "^1.0.0",
     "core-util-is": "~1.0.0",
-    "isarray": "~1.0.0",
     "inherits": "~2.0.1",
+    "isarray": "~1.0.0",
     "process-nextick-args": "~1.0.6",
     "string_decoder": "~0.10.x",
     "util-deprecate": "~1.0.1"
   },
   "devDependencies": {
-    "assert": "~1.4.0",
-    "babel-polyfill": "^6.9.1",
-    "buffer": "^4.9.0",
-    "nyc": "^6.4.0",
-    "tap": "~0.7.1",
+    "tap": "~0.2.6",
     "tape": "~4.5.1",
-    "zuul": "~3.10.0"
+    "zuul": "~3.9.0"
   },
   "scripts": {
     "test": "tap test/parallel/*.js test/ours/*.js",
-    "browser": "npm run write-zuul && zuul --browser-retries 2 -- test/browser.js",
-    "write-zuul": "printf \"ui: tape\nbrowsers:\n  - name: $BROWSER_NAME\n    version: $BROWSER_VERSION\n\">.zuul.yml",
-    "local": "zuul --local 3000 --no-coverage -- test/browser.js",
-    "cover": "nyc npm test",
-    "report": "nyc report --reporter=lcov"
+    "browser": "npm run write-zuul && zuul -- test/browser.js",
+    "write-zuul": "printf \"ui: tape\nbrowsers:\n  - name: $BROWSER_NAME\n    version: $BROWSER_VERSION\n\">.zuul.yml"
   },
   "repository": {
     "type": "git",
@@ -41,10 +33,5 @@
   "browser": {
     "util": false
   },
-  "nyc": {
-    "include": [
-      "lib/**.js"
-    ]
-  },
   "license": "MIT"
 }
diff --git a/node_modules/readable-stream/readable.js b/node_modules/readable-stream/readable.js
index be2688a07..6222a5798 100644
--- a/node_modules/readable-stream/readable.js
+++ b/node_modules/readable-stream/readable.js
@@ -10,7 +10,3 @@ exports.Writable = require('./lib/_stream_writable.js');
 exports.Duplex = require('./lib/_stream_duplex.js');
 exports.Transform = require('./lib/_stream_transform.js');
 exports.PassThrough = require('./lib/_stream_passthrough.js');
-
-if (!process.browser && process.env.READABLE_STREAM === 'disable' && Stream) {
-  module.exports = Stream;
-}
diff --git a/node_modules/supports-color/index.js b/node_modules/supports-color/index.js
index 113040d63..a2b978450 100644
--- a/node_modules/supports-color/index.js
+++ b/node_modules/supports-color/index.js
@@ -1,72 +1,39 @@
 'use strict';
-var hasFlag = require('has-flag');
+var argv = process.argv;
 
-var support = function (level) {
-	if (level === 0) {
+module.exports = (function () {
+	if (argv.indexOf('--no-color') !== -1 ||
+		argv.indexOf('--no-colors') !== -1 ||
+		argv.indexOf('--color=false') !== -1) {
 		return false;
 	}
 
-	return {
-		level: level,
-		hasBasic: true,
-		has256: level >= 2,
-		has16m: level >= 3
-	};
-};
-
-var supportLevel = (function () {
-	if (hasFlag('no-color') ||
-		hasFlag('no-colors') ||
-		hasFlag('color=false')) {
-		return 0;
-	}
-
-	if (hasFlag('color=16m') ||
-		hasFlag('color=full') ||
-		hasFlag('color=truecolor')) {
-		return 3;
-	}
-
-	if (hasFlag('color=256')) {
-		return 2;
-	}
-
-	if (hasFlag('color') ||
-		hasFlag('colors') ||
-		hasFlag('color=true') ||
-		hasFlag('color=always')) {
-		return 1;
+	if (argv.indexOf('--color') !== -1 ||
+		argv.indexOf('--colors') !== -1 ||
+		argv.indexOf('--color=true') !== -1 ||
+		argv.indexOf('--color=always') !== -1) {
+		return true;
 	}
 
 	if (process.stdout && !process.stdout.isTTY) {
-		return 0;
+		return false;
 	}
 
 	if (process.platform === 'win32') {
-		return 1;
+		return true;
 	}
 
 	if ('COLORTERM' in process.env) {
-		return 1;
+		return true;
 	}
 
 	if (process.env.TERM === 'dumb') {
-		return 0;
-	}
-
-	if (/^xterm-256(?:color)?/.test(process.env.TERM)) {
-		return 2;
+		return false;
 	}
 
 	if (/^screen|^xterm|^vt100|color|ansi|cygwin|linux/i.test(process.env.TERM)) {
-		return 1;
+		return true;
 	}
 
-	return 0;
+	return false;
 })();
-
-if (supportLevel === 0 && 'FORCE_COLOR' in process.env) {
-	supportLevel = 1;
-}
-
-module.exports = process && support(supportLevel);
diff --git a/node_modules/supports-color/package.json b/node_modules/supports-color/package.json
index 0f08cb90a..7f72e762a 100644
--- a/node_modules/supports-color/package.json
+++ b/node_modules/supports-color/package.json
@@ -1,32 +1,30 @@
 {
   "name": "supports-color",
-  "version": "3.1.2",
+  "version": "1.2.0",
   "description": "Detect whether a terminal supports color",
   "license": "MIT",
-  "repository": "chalk/supports-color",
+  "repository": "sindresorhus/supports-color",
   "author": {
     "name": "Sindre Sorhus",
     "email": "sindresorhus@gmail.com",
-    "url": "sindresorhus.com"
+    "url": "http://sindresorhus.com"
+  },
+  "bin": {
+    "supports-color": "cli.js"
   },
-  "maintainers": [
-    "Sindre Sorhus <sindresorhus@gmail.com> (sindresorhus.com)",
-    "Joshua Appelman <jappelman@xebia.com> (jbnicolai.com)",
-    "JD Ballard <i.am.qix@gmail.com> (github.com/qix-)"
-  ],
-  "browser": "browser.js",
   "engines": {
-    "node": ">=0.8.0"
+    "node": ">=0.10.0"
   },
   "scripts": {
-    "test": "xo && mocha",
-    "travis": "mocha"
+    "test": "mocha"
   },
   "files": [
     "index.js",
-    "browser.js"
+    "cli.js"
   ],
   "keywords": [
+    "cli",
+    "bin",
     "color",
     "colour",
     "colors",
@@ -44,23 +42,10 @@
     "support",
     "supports",
     "capability",
-    "detect",
-    "truecolor",
-    "16m",
-    "million"
+    "detect"
   ],
-  "dependencies": {
-    "has-flag": "^1.0.0"
-  },
   "devDependencies": {
     "mocha": "*",
-    "require-uncached": "^1.0.2",
-    "xo": "*"
-  },
-  "xo": {
-    "envs": [
-      "node",
-      "mocha"
-    ]
+    "require-uncached": "^1.0.2"
   }
 }
diff --git a/node_modules/supports-color/readme.md b/node_modules/supports-color/readme.md
index f7bae4c54..32d4f46e9 100644
--- a/node_modules/supports-color/readme.md
+++ b/node_modules/supports-color/readme.md
@@ -1,11 +1,11 @@
-# supports-color [![Build Status](https://travis-ci.org/chalk/supports-color.svg?branch=master)](https://travis-ci.org/chalk/supports-color)
+# supports-color [![Build Status](https://travis-ci.org/sindresorhus/supports-color.svg?branch=master)](https://travis-ci.org/sindresorhus/supports-color)
 
 > Detect whether a terminal supports color
 
 
 ## Install
 
-```
+```sh
 $ npm install --save supports-color
 ```
 
@@ -18,41 +18,25 @@ var supportsColor = require('supports-color');
 if (supportsColor) {
 	console.log('Terminal supports color');
 }
-
-if (supportsColor.has256) {
-	console.log('Terminal supports 256 colors');
-}
-
-if (supportsColor.has16m) {
-	console.log('Terminal supports 16 million colors (truecolor)');
-}
 ```
 
-
-## API
-
-Returns an `object`, or `false` if color is not supported.
-
-The returned object specifies a level of support for color through a `.level` property and a corresponding flag:
-
-- `.level = 1` and `.hasBasic = true`: Basic color support (16 colors)
-- `.level = 2` and `.has256 = true`: 256 color support
-- `.level = 3` and `.has16m = true`: 16 million (truecolor) support
-
-
-## Info
-
 It obeys the `--color` and `--no-color` CLI flags.
 
-For situations where using `--color` is not possible, add an environment variable `FORCE_COLOR` with any value to force color. Trumps `--no-color`.
 
-Explicit 256/truecolor mode can be enabled using the `--color=256` and `--color=16m` flags, respectively.
+## CLI
 
+```sh
+$ npm install --global supports-color
+```
+
+```
+$ supports-color --help
 
-## Related
+  Usage
+    supports-color
 
-- [supports-color-cli](https://github.com/chalk/supports-color-cli) - CLI for this module
-- [chalk](https://github.com/chalk/chalk) - Terminal string styling done right
+  Exits with code 0 if color is supported and 1 if not
+```
 
 
 ## License
diff --git a/node_modules/tar-stream/node_modules/end-of-stream/.npmignore b/node_modules/tar-stream/node_modules/end-of-stream/.npmignore
deleted file mode 100644
index 3c3629e64..000000000
--- a/node_modules/tar-stream/node_modules/end-of-stream/.npmignore
+++ /dev/null
@@ -1 +0,0 @@
-node_modules
diff --git a/node_modules/tar-stream/node_modules/end-of-stream/LICENSE b/node_modules/tar-stream/node_modules/end-of-stream/LICENSE
deleted file mode 100644
index 757562ec5..000000000
--- a/node_modules/tar-stream/node_modules/end-of-stream/LICENSE
+++ /dev/null
@@ -1,21 +0,0 @@
-The MIT License (MIT)
-
-Copyright (c) 2014 Mathias Buus
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
\ No newline at end of file
diff --git a/node_modules/tar-stream/node_modules/end-of-stream/README.md b/node_modules/tar-stream/node_modules/end-of-stream/README.md
deleted file mode 100644
index df800c1eb..000000000
--- a/node_modules/tar-stream/node_modules/end-of-stream/README.md
+++ /dev/null
@@ -1,47 +0,0 @@
-# end-of-stream
-
-A node module that calls a callback when a readable/writable/duplex stream has completed or failed.
-
-	npm install end-of-stream
-
-## Usage
-
-Simply pass a stream and a callback to the `eos`.
-Both legacy streams and streams2 are supported.
-
-``` js
-var eos = require('end-of-stream');
-
-eos(readableStream, function(err) {
-	if (err) return console.log('stream had an error or closed early');
-	console.log('stream has ended');
-});
-
-eos(writableStream, function(err) {
-	if (err) return console.log('stream had an error or closed early');
-	console.log('stream has finished');
-});
-
-eos(duplexStream, function(err) {
-	if (err) return console.log('stream had an error or closed early');
-	console.log('stream has ended and finished');
-});
-
-eos(duplexStream, {readable:false}, function(err) {
-	if (err) return console.log('stream had an error or closed early');
-	console.log('stream has ended but might still be writable');
-});
-
-eos(duplexStream, {writable:false}, function(err) {
-	if (err) return console.log('stream had an error or closed early');
-	console.log('stream has ended but might still be readable');
-});
-
-eos(readableStream, {error:false}, function(err) {
-	// do not treat emit('error', err) as a end-of-stream
-});
-```
-
-## License
-
-MIT
\ No newline at end of file
diff --git a/node_modules/tar-stream/node_modules/end-of-stream/index.js b/node_modules/tar-stream/node_modules/end-of-stream/index.js
deleted file mode 100644
index f92fc19fe..000000000
--- a/node_modules/tar-stream/node_modules/end-of-stream/index.js
+++ /dev/null
@@ -1,83 +0,0 @@
-var once = require('once');
-
-var noop = function() {};
-
-var isRequest = function(stream) {
-	return stream.setHeader && typeof stream.abort === 'function';
-};
-
-var isChildProcess = function(stream) {
-	return stream.stdio && Array.isArray(stream.stdio) && stream.stdio.length === 3
-};
-
-var eos = function(stream, opts, callback) {
-	if (typeof opts === 'function') return eos(stream, null, opts);
-	if (!opts) opts = {};
-
-	callback = once(callback || noop);
-
-	var ws = stream._writableState;
-	var rs = stream._readableState;
-	var readable = opts.readable || (opts.readable !== false && stream.readable);
-	var writable = opts.writable || (opts.writable !== false && stream.writable);
-
-	var onlegacyfinish = function() {
-		if (!stream.writable) onfinish();
-	};
-
-	var onfinish = function() {
-		writable = false;
-		if (!readable) callback();
-	};
-
-	var onend = function() {
-		readable = false;
-		if (!writable) callback();
-	};
-
-	var onexit = function(exitCode) {
-		callback(exitCode ? new Error('exited with error code: ' + exitCode) : null);
-	};
-
-	var onclose = function() {
-		if (readable && !(rs && rs.ended)) return callback(new Error('premature close'));
-		if (writable && !(ws && ws.ended)) return callback(new Error('premature close'));
-	};
-
-	var onrequest = function() {
-		stream.req.on('finish', onfinish);
-	};
-
-	if (isRequest(stream)) {
-		stream.on('complete', onfinish);
-		stream.on('abort', onclose);
-		if (stream.req) onrequest();
-		else stream.on('request', onrequest);
-	} else if (writable && !ws) { // legacy streams
-		stream.on('end', onlegacyfinish);
-		stream.on('close', onlegacyfinish);
-	}
-
-	if (isChildProcess(stream)) stream.on('exit', onexit);
-
-	stream.on('end', onend);
-	stream.on('finish', onfinish);
-	if (opts.error !== false) stream.on('error', callback);
-	stream.on('close', onclose);
-
-	return function() {
-		stream.removeListener('complete', onfinish);
-		stream.removeListener('abort', onclose);
-		stream.removeListener('request', onrequest);
-		if (stream.req) stream.req.removeListener('finish', onfinish);
-		stream.removeListener('end', onlegacyfinish);
-		stream.removeListener('close', onlegacyfinish);
-		stream.removeListener('finish', onfinish);
-		stream.removeListener('exit', onexit);
-		stream.removeListener('end', onend);
-		stream.removeListener('error', callback);
-		stream.removeListener('close', onclose);
-	};
-};
-
-module.exports = eos;
\ No newline at end of file
diff --git a/node_modules/tar-stream/node_modules/end-of-stream/package.json b/node_modules/tar-stream/node_modules/end-of-stream/package.json
deleted file mode 100644
index 94b96add4..000000000
--- a/node_modules/tar-stream/node_modules/end-of-stream/package.json
+++ /dev/null
@@ -1,31 +0,0 @@
-{
-  "name": "end-of-stream",
-  "version": "1.1.0",
-  "description": "Call a callback when a readable/writable/duplex stream has completed or failed.",
-  "repository": {
-    "type": "git",
-    "url": "git://github.com/mafintosh/end-of-stream.git"
-  },
-  "dependencies": {
-    "once": "~1.3.0"
-  },
-  "scripts": {
-    "test": "node test.js"
-  },
-  "keywords": [
-    "stream",
-    "streams",
-    "callback",
-    "finish",
-    "close",
-    "end",
-    "wait"
-  ],
-  "bugs": {
-    "url": "https://github.com/mafintosh/end-of-stream/issues"
-  },
-  "homepage": "https://github.com/mafintosh/end-of-stream",
-  "main": "index.js",
-  "author": "Mathias Buus <mathiasbuus@gmail.com>",
-  "license": "MIT"
-}
diff --git a/node_modules/tar-stream/node_modules/end-of-stream/test.js b/node_modules/tar-stream/node_modules/end-of-stream/test.js
deleted file mode 100644
index 03cb93e2e..000000000
--- a/node_modules/tar-stream/node_modules/end-of-stream/test.js
+++ /dev/null
@@ -1,77 +0,0 @@
-var assert = require('assert');
-var eos = require('./index');
-
-var expected = 8;
-var fs = require('fs');
-var cp = require('child_process');
-var net = require('net');
-
-var ws = fs.createWriteStream('/dev/null');
-eos(ws, function(err) {
-	expected--;
-	assert(!!err);
-	if (!expected) process.exit(0);
-});
-ws.close();
-
-var rs = fs.createReadStream('/dev/random');
-eos(rs, function(err) {
-	expected--;
-	assert(!!err);
-	if (!expected) process.exit(0);
-});
-rs.close();
-
-var rs = fs.createReadStream(__filename);
-eos(rs, function(err) {
-	expected--;
-	assert(!err);
-	if (!expected) process.exit(0);
-});
-rs.pipe(fs.createWriteStream('/dev/null'));
-
-var rs = fs.createReadStream(__filename);
-eos(rs, function(err) {
-	throw new Error('no go')
-})();
-rs.pipe(fs.createWriteStream('/dev/null'));
-
-var exec = cp.exec('echo hello world');
-eos(exec, function(err) {
-	expected--;
-	assert(!err);
-	if (!expected) process.exit(0);
-});
-
-var spawn = cp.spawn('echo', ['hello world']);
-eos(spawn, function(err) {
-	expected--;
-	assert(!err);
-	if (!expected) process.exit(0);
-});
-
-var socket = net.connect(50000);
-eos(socket, function(err) {
-	expected--;
-	assert(!!err);
-	if (!expected) process.exit(0);
-});
-
-var server = net.createServer(function(socket) {
-	eos(socket, function() {
-		expected--;
-		if (!expected) process.exit(0);
-	});
-	socket.destroy();
-}).listen(30000, function() {
-	var socket = net.connect(30000);
-	eos(socket, function() {
-		expected--;
-		if (!expected) process.exit(0);
-	});
-});
-
-setTimeout(function() {
-	assert(expected === 0);
-	process.exit(0);
-}, 1000);
diff --git a/node_modules/tar-stream/node_modules/once/LICENSE b/node_modules/tar-stream/node_modules/once/LICENSE
deleted file mode 100644
index 19129e315..000000000
--- a/node_modules/tar-stream/node_modules/once/LICENSE
+++ /dev/null
@@ -1,15 +0,0 @@
-The ISC License
-
-Copyright (c) Isaac Z. Schlueter and Contributors
-
-Permission to use, copy, modify, and/or distribute this software for any
-purpose with or without fee is hereby granted, provided that the above
-copyright notice and this permission notice appear in all copies.
-
-THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
-IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
diff --git a/node_modules/tar-stream/node_modules/once/README.md b/node_modules/tar-stream/node_modules/once/README.md
deleted file mode 100644
index a2981ea07..000000000
--- a/node_modules/tar-stream/node_modules/once/README.md
+++ /dev/null
@@ -1,51 +0,0 @@
-# once
-
-Only call a function once.
-
-## usage
-
-```javascript
-var once = require('once')
-
-function load (file, cb) {
-  cb = once(cb)
-  loader.load('file')
-  loader.once('load', cb)
-  loader.once('error', cb)
-}
-```
-
-Or add to the Function.prototype in a responsible way:
-
-```javascript
-// only has to be done once
-require('once').proto()
-
-function load (file, cb) {
-  cb = cb.once()
-  loader.load('file')
-  loader.once('load', cb)
-  loader.once('error', cb)
-}
-```
-
-Ironically, the prototype feature makes this module twice as
-complicated as necessary.
-
-To check whether you function has been called, use `fn.called`. Once the
-function is called for the first time the return value of the original
-function is saved in `fn.value` and subsequent calls will continue to
-return this value.
-
-```javascript
-var once = require('once')
-
-function load (cb) {
-  cb = once(cb)
-  var stream = createStream()
-  stream.once('data', cb)
-  stream.once('end', function () {
-    if (!cb.called) cb(new Error('not found'))
-  })
-}
-```
diff --git a/node_modules/tar-stream/node_modules/once/once.js b/node_modules/tar-stream/node_modules/once/once.js
deleted file mode 100644
index 2e1e721bf..000000000
--- a/node_modules/tar-stream/node_modules/once/once.js
+++ /dev/null
@@ -1,21 +0,0 @@
-var wrappy = require('wrappy')
-module.exports = wrappy(once)
-
-once.proto = once(function () {
-  Object.defineProperty(Function.prototype, 'once', {
-    value: function () {
-      return once(this)
-    },
-    configurable: true
-  })
-})
-
-function once (fn) {
-  var f = function () {
-    if (f.called) return f.value
-    f.called = true
-    return f.value = fn.apply(this, arguments)
-  }
-  f.called = false
-  return f
-}
diff --git a/node_modules/tar-stream/node_modules/once/package.json b/node_modules/tar-stream/node_modules/once/package.json
deleted file mode 100644
index 28fe2ff72..000000000
--- a/node_modules/tar-stream/node_modules/once/package.json
+++ /dev/null
@@ -1,33 +0,0 @@
-{
-  "name": "once",
-  "version": "1.3.3",
-  "description": "Run a function exactly one time",
-  "main": "once.js",
-  "directories": {
-    "test": "test"
-  },
-  "dependencies": {
-    "wrappy": "1"
-  },
-  "devDependencies": {
-    "tap": "^1.2.0"
-  },
-  "scripts": {
-    "test": "tap test/*.js"
-  },
-  "files": [
-    "once.js"
-  ],
-  "repository": {
-    "type": "git",
-    "url": "git://github.com/isaacs/once"
-  },
-  "keywords": [
-    "once",
-    "function",
-    "one",
-    "single"
-  ],
-  "author": "Isaac Z. Schlueter <i@izs.me> (http://blog.izs.me/)",
-  "license": "ISC"
-}
diff --git a/node_modules/through2/node_modules/readable-stream/.npmignore b/node_modules/through2/node_modules/readable-stream/.npmignore
deleted file mode 100644
index 38344f87a..000000000
--- a/node_modules/through2/node_modules/readable-stream/.npmignore
+++ /dev/null
@@ -1,5 +0,0 @@
-build/
-test/
-examples/
-fs.js
-zlib.js
\ No newline at end of file
diff --git a/node_modules/through2/node_modules/readable-stream/.travis.yml b/node_modules/through2/node_modules/readable-stream/.travis.yml
deleted file mode 100644
index 1b8211846..000000000
--- a/node_modules/through2/node_modules/readable-stream/.travis.yml
+++ /dev/null
@@ -1,52 +0,0 @@
-sudo: false
-language: node_js
-before_install:
-  - npm install -g npm@2
-  - npm install -g npm
-notifications:
-  email: false
-matrix:
-  fast_finish: true
-  allow_failures:
-    - env: TASK=browser BROWSER_NAME=ipad BROWSER_VERSION="6.0..latest"
-    - env: TASK=browser BROWSER_NAME=iphone BROWSER_VERSION="6.0..latest"
-  include:
-  - node_js: '0.8'
-    env: TASK=test
-  - node_js: '0.10'
-    env: TASK=test
-  - node_js: '0.11'
-    env: TASK=test
-  - node_js: '0.12'
-    env: TASK=test
-  - node_js: 1
-    env: TASK=test
-  - node_js: 2
-    env: TASK=test
-  - node_js: 3
-    env: TASK=test
-  - node_js: 4
-    env: TASK=test
-  - node_js: 5
-    env: TASK=test
-  - node_js: 5
-    env: TASK=browser BROWSER_NAME=android BROWSER_VERSION="4.0..latest"
-  - node_js: 5
-    env: TASK=browser BROWSER_NAME=ie BROWSER_VERSION="9..latest"
-  - node_js: 5
-    env: TASK=browser BROWSER_NAME=opera BROWSER_VERSION="11..latest"
-  - node_js: 5
-    env: TASK=browser BROWSER_NAME=chrome BROWSER_VERSION="-3..latest"
-  - node_js: 5
-    env: TASK=browser BROWSER_NAME=firefox BROWSER_VERSION="-3..latest"
-  - node_js: 5
-    env: TASK=browser BROWSER_NAME=ipad BROWSER_VERSION="6.0..latest"
-  - node_js: 5
-    env: TASK=browser BROWSER_NAME=iphone BROWSER_VERSION="6.0..latest"
-  - node_js: 5
-    env: TASK=browser BROWSER_NAME=safari BROWSER_VERSION="5..latest"
-script: "npm run $TASK"
-env:
-  global:
-  - secure: rE2Vvo7vnjabYNULNyLFxOyt98BoJexDqsiOnfiD6kLYYsiQGfr/sbZkPMOFm9qfQG7pjqx+zZWZjGSswhTt+626C0t/njXqug7Yps4c3dFblzGfreQHp7wNX5TFsvrxd6dAowVasMp61sJcRnB2w8cUzoe3RAYUDHyiHktwqMc=
-  - secure: g9YINaKAdMatsJ28G9jCGbSaguXCyxSTy+pBO6Ch0Cf57ZLOTka3HqDj8p3nV28LUIHZ3ut5WO43CeYKwt4AUtLpBS3a0dndHdY6D83uY6b2qh5hXlrcbeQTq2cvw2y95F7hm4D1kwrgZ7ViqaKggRcEupAL69YbJnxeUDKWEdI=
diff --git a/node_modules/through2/node_modules/readable-stream/.zuul.yml b/node_modules/through2/node_modules/readable-stream/.zuul.yml
deleted file mode 100644
index 96d9cfbd3..000000000
--- a/node_modules/through2/node_modules/readable-stream/.zuul.yml
+++ /dev/null
@@ -1 +0,0 @@
-ui: tape
diff --git a/node_modules/through2/node_modules/readable-stream/LICENSE b/node_modules/through2/node_modules/readable-stream/LICENSE
deleted file mode 100644
index e3d4e695a..000000000
--- a/node_modules/through2/node_modules/readable-stream/LICENSE
+++ /dev/null
@@ -1,18 +0,0 @@
-Copyright Joyent, Inc. and other Node contributors. All rights reserved.
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to
-deal in the Software without restriction, including without limitation the
-rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
-sell copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
-FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
-IN THE SOFTWARE.
diff --git a/node_modules/through2/node_modules/readable-stream/README.md b/node_modules/through2/node_modules/readable-stream/README.md
deleted file mode 100644
index 86b95a3bf..000000000
--- a/node_modules/through2/node_modules/readable-stream/README.md
+++ /dev/null
@@ -1,36 +0,0 @@
-# readable-stream
-
-***Node-core v5.8.0 streams for userland*** [![Build Status](https://travis-ci.org/nodejs/readable-stream.svg?branch=master)](https://travis-ci.org/nodejs/readable-stream)
-
-
-[![NPM](https://nodei.co/npm/readable-stream.png?downloads=true&downloadRank=true)](https://nodei.co/npm/readable-stream/)
-[![NPM](https://nodei.co/npm-dl/readable-stream.png?&months=6&height=3)](https://nodei.co/npm/readable-stream/)
-
-
-[![Sauce Test Status](https://saucelabs.com/browser-matrix/readable-stream.svg)](https://saucelabs.com/u/readable-stream)
-
-```bash
-npm install --save readable-stream
-```
-
-***Node-core streams for userland***
-
-This package is a mirror of the Streams2 and Streams3 implementations in
-Node-core, including [documentation](doc/stream.markdown).
-
-If you want to guarantee a stable streams base, regardless of what version of
-Node you, or the users of your libraries are using, use **readable-stream** *only* and avoid the *"stream"* module in Node-core, for background see [this blogpost](http://r.va.gg/2014/06/why-i-dont-use-nodes-core-stream-module.html).
-
-As of version 2.0.0 **readable-stream** uses semantic versioning.  
-
-# Streams WG Team Members
-
-* **Chris Dickinson** ([@chrisdickinson](https://github.com/chrisdickinson)) &lt;christopher.s.dickinson@gmail.com&gt;
-  - Release GPG key: 9554F04D7259F04124DE6B476D5A82AC7E37093B
-* **Calvin Metcalf** ([@calvinmetcalf](https://github.com/calvinmetcalf)) &lt;calvin.metcalf@gmail.com&gt;
-  - Release GPG key: F3EF5F62A87FC27A22E643F714CE4FF5015AA242
-* **Rod Vagg** ([@rvagg](https://github.com/rvagg)) &lt;rod@vagg.org&gt;
-  - Release GPG key: DD8F2338BAE7501E3DD5AC78C273792F7D83545D
-* **Sam Newman** ([@sonewman](https://github.com/sonewman)) &lt;newmansam@outlook.com&gt;
-* **Mathias Buus** ([@mafintosh](https://github.com/mafintosh)) &lt;mathiasbuus@gmail.com&gt;
-* **Domenic Denicola** ([@domenic](https://github.com/domenic)) &lt;d@domenic.me&gt;
diff --git a/node_modules/through2/node_modules/readable-stream/doc/stream.markdown b/node_modules/through2/node_modules/readable-stream/doc/stream.markdown
deleted file mode 100644
index 0bc3819e6..000000000
--- a/node_modules/through2/node_modules/readable-stream/doc/stream.markdown
+++ /dev/null
@@ -1,1760 +0,0 @@
-# Stream
-
-    Stability: 2 - Stable
-
-A stream is an abstract interface implemented by various objects in
-Node.js. For example a [request to an HTTP server][http-incoming-message] is a
-stream, as is [`process.stdout`][]. Streams are readable, writable, or both. All
-streams are instances of [`EventEmitter`][].
-
-You can load the Stream base classes by doing `require('stream')`.
-There are base classes provided for [Readable][] streams, [Writable][]
-streams, [Duplex][] streams, and [Transform][] streams.
-
-This document is split up into 3 sections:
-
-1. The first section explains the parts of the API that you need to be
-   aware of to use streams in your programs.
-2. The second section explains the parts of the API that you need to
-   use if you implement your own custom streams yourself. The API is designed to
-   make this easy for you to do.
-3. The third section goes into more depth about how streams work,
-   including some of the internal mechanisms and functions that you
-   should probably not modify unless you definitely know what you are
-   doing.
-
-
-## API for Stream Consumers
-
-<!--type=misc-->
-
-Streams can be either [Readable][], [Writable][], or both ([Duplex][]).
-
-All streams are EventEmitters, but they also have other custom methods
-and properties depending on whether they are Readable, Writable, or
-Duplex.
-
-If a stream is both Readable and Writable, then it implements all of
-the methods and events. So, a [Duplex][] or [Transform][] stream is
-fully described by this API, though their implementation may be
-somewhat different.
-
-It is not necessary to implement Stream interfaces in order to consume
-streams in your programs. If you **are** implementing streaming
-interfaces in your own program, please also refer to
-[API for Stream Implementors][].
-
-Almost all Node.js programs, no matter how simple, use Streams in some
-way. Here is an example of using Streams in an Node.js program:
-
-```js
-const http = require('http');
-
-var server = http.createServer( (req, res) => {
-  // req is an http.IncomingMessage, which is a Readable Stream
-  // res is an http.ServerResponse, which is a Writable Stream
-
-  var body = '';
-  // we want to get the data as utf8 strings
-  // If you don't set an encoding, then you'll get Buffer objects
-  req.setEncoding('utf8');
-
-  // Readable streams emit 'data' events once a listener is added
-  req.on('data', (chunk) => {
-    body += chunk;
-  });
-
-  // the end event tells you that you have entire body
-  req.on('end', () => {
-    try {
-      var data = JSON.parse(body);
-    } catch (er) {
-      // uh oh!  bad json!
-      res.statusCode = 400;
-      return res.end(`error: ${er.message}`);
-    }
-
-    // write back something interesting to the user:
-    res.write(typeof data);
-    res.end();
-  });
-});
-
-server.listen(1337);
-
-// $ curl localhost:1337 -d '{}'
-// object
-// $ curl localhost:1337 -d '"foo"'
-// string
-// $ curl localhost:1337 -d 'not json'
-// error: Unexpected token o
-```
-
-### Class: stream.Duplex
-
-Duplex streams are streams that implement both the [Readable][] and
-[Writable][] interfaces.
-
-Examples of Duplex streams include:
-
-* [TCP sockets][]
-* [zlib streams][zlib]
-* [crypto streams][crypto]
-
-### Class: stream.Readable
-
-<!--type=class-->
-
-The Readable stream interface is the abstraction for a *source* of
-data that you are reading from. In other words, data comes *out* of a
-Readable stream.
-
-A Readable stream will not start emitting data until you indicate that
-you are ready to receive it.
-
-Readable streams have two "modes": a **flowing mode** and a **paused
-mode**. When in flowing mode, data is read from the underlying system
-and provided to your program as fast as possible. In paused mode, you
-must explicitly call [`stream.read()`][stream-read] to get chunks of data out.
-Streams start out in paused mode.
-
-**Note**: If no data event handlers are attached, and there are no
-[`stream.pipe()`][] destinations, and the stream is switched into flowing
-mode, then data will be lost.
-
-You can switch to flowing mode by doing any of the following:
-
-* Adding a [`'data'`][] event handler to listen for data.
-* Calling the [`stream.resume()`][stream-resume] method to explicitly open the
-  flow.
-* Calling the [`stream.pipe()`][] method to send the data to a [Writable][].
-
-You can switch back to paused mode by doing either of the following:
-
-* If there are no pipe destinations, by calling the
-  [`stream.pause()`][stream-pause] method.
-* If there are pipe destinations, by removing any [`'data'`][] event
-  handlers, and removing all pipe destinations by calling the
-  [`stream.unpipe()`][] method.
-
-Note that, for backwards compatibility reasons, removing [`'data'`][]
-event handlers will **not** automatically pause the stream. Also, if
-there are piped destinations, then calling [`stream.pause()`][stream-pause] will
-not guarantee that the stream will *remain* paused once those
-destinations drain and ask for more data.
-
-Examples of readable streams include:
-
-* [HTTP responses, on the client][http-incoming-message]
-* [HTTP requests, on the server][http-incoming-message]
-* [fs read streams][]
-* [zlib streams][zlib]
-* [crypto streams][crypto]
-* [TCP sockets][]
-* [child process stdout and stderr][]
-* [`process.stdin`][]
-
-#### Event: 'close'
-
-Emitted when the stream and any of its underlying resources (a file
-descriptor, for example) have been closed. The event indicates that
-no more events will be emitted, and no further computation will occur.
-
-Not all streams will emit the `'close'` event.
-
-#### Event: 'data'
-
-* `chunk` {Buffer|String} The chunk of data.
-
-Attaching a `'data'` event listener to a stream that has not been
-explicitly paused will switch the stream into flowing mode. Data will
-then be passed as soon as it is available.
-
-If you just want to get all the data out of the stream as fast as
-possible, this is the best way to do so.
-
-```js
-var readable = getReadableStreamSomehow();
-readable.on('data', (chunk) => {
-  console.log('got %d bytes of data', chunk.length);
-});
-```
-
-#### Event: 'end'
-
-This event fires when there will be no more data to read.
-
-Note that the `'end'` event **will not fire** unless the data is
-completely consumed. This can be done by switching into flowing mode,
-or by calling [`stream.read()`][stream-read] repeatedly until you get to the
-end.
-
-```js
-var readable = getReadableStreamSomehow();
-readable.on('data', (chunk) => {
-  console.log('got %d bytes of data', chunk.length);
-});
-readable.on('end', () => {
-  console.log('there will be no more data.');
-});
-```
-
-#### Event: 'error'
-
-* {Error Object}
-
-Emitted if there was an error receiving data.
-
-#### Event: 'readable'
-
-When a chunk of data can be read from the stream, it will emit a
-`'readable'` event.
-
-In some cases, listening for a `'readable'` event will cause some data
-to be read into the internal buffer from the underlying system, if it
-hadn't already.
-
-```javascript
-var readable = getReadableStreamSomehow();
-readable.on('readable', () => {
-  // there is some data to read now
-});
-```
-
-Once the internal buffer is drained, a `'readable'` event will fire
-again when more data is available.
-
-The `'readable'` event is not emitted in the "flowing" mode with the
-sole exception of the last one, on end-of-stream.
-
-The `'readable'` event indicates that the stream has new information:
-either new data is available or the end of the stream has been reached.
-In the former case, [`stream.read()`][stream-read] will return that data. In the
-latter case, [`stream.read()`][stream-read] will return null. For instance, in
-the following example, `foo.txt` is an empty file:
-
-```js
-const fs = require('fs');
-var rr = fs.createReadStream('foo.txt');
-rr.on('readable', () => {
-  console.log('readable:', rr.read());
-});
-rr.on('end', () => {
-  console.log('end');
-});
-```
-
-The output of running this script is:
-
-```
-$ node test.js
-readable: null
-end
-```
-
-#### readable.isPaused()
-
-* Return: {Boolean}
-
-This method returns whether or not the `readable` has been **explicitly**
-paused by client code (using [`stream.pause()`][stream-pause] without a
-corresponding [`stream.resume()`][stream-resume]).
-
-```js
-var readable = new stream.Readable
-
-readable.isPaused() // === false
-readable.pause()
-readable.isPaused() // === true
-readable.resume()
-readable.isPaused() // === false
-```
-
-#### readable.pause()
-
-* Return: `this`
-
-This method will cause a stream in flowing mode to stop emitting
-[`'data'`][] events, switching out of flowing mode. Any data that becomes
-available will remain in the internal buffer.
-
-```js
-var readable = getReadableStreamSomehow();
-readable.on('data', (chunk) => {
-  console.log('got %d bytes of data', chunk.length);
-  readable.pause();
-  console.log('there will be no more data for 1 second');
-  setTimeout(() => {
-    console.log('now data will start flowing again');
-    readable.resume();
-  }, 1000);
-});
-```
-
-#### readable.pipe(destination[, options])
-
-* `destination` {stream.Writable} The destination for writing data
-* `options` {Object} Pipe options
-  * `end` {Boolean} End the writer when the reader ends. Default = `true`
-
-This method pulls all the data out of a readable stream, and writes it
-to the supplied destination, automatically managing the flow so that
-the destination is not overwhelmed by a fast readable stream.
-
-Multiple destinations can be piped to safely.
-
-```js
-var readable = getReadableStreamSomehow();
-var writable = fs.createWriteStream('file.txt');
-// All the data from readable goes into 'file.txt'
-readable.pipe(writable);
-```
-
-This function returns the destination stream, so you can set up pipe
-chains like so:
-
-```js
-var r = fs.createReadStream('file.txt');
-var z = zlib.createGzip();
-var w = fs.createWriteStream('file.txt.gz');
-r.pipe(z).pipe(w);
-```
-
-For example, emulating the Unix `cat` command:
-
-```js
-process.stdin.pipe(process.stdout);
-```
-
-By default [`stream.end()`][stream-end] is called on the destination when the
-source stream emits [`'end'`][], so that `destination` is no longer writable.
-Pass `{ end: false }` as `options` to keep the destination stream open.
-
-This keeps `writer` open so that "Goodbye" can be written at the
-end.
-
-```js
-reader.pipe(writer, { end: false });
-reader.on('end', () => {
-  writer.end('Goodbye\n');
-});
-```
-
-Note that [`process.stderr`][] and [`process.stdout`][] are never closed until
-the process exits, regardless of the specified options.
-
-#### readable.read([size])
-
-* `size` {Number} Optional argument to specify how much data to read.
-* Return {String|Buffer|Null}
-
-The `read()` method pulls some data out of the internal buffer and
-returns it. If there is no data available, then it will return
-`null`.
-
-If you pass in a `size` argument, then it will return that many
-bytes. If `size` bytes are not available, then it will return `null`,
-unless we've ended, in which case it will return the data remaining
-in the buffer.
-
-If you do not specify a `size` argument, then it will return all the
-data in the internal buffer.
-
-This method should only be called in paused mode. In flowing mode,
-this method is called automatically until the internal buffer is
-drained.
-
-```js
-var readable = getReadableStreamSomehow();
-readable.on('readable', () => {
-  var chunk;
-  while (null !== (chunk = readable.read())) {
-    console.log('got %d bytes of data', chunk.length);
-  }
-});
-```
-
-If this method returns a data chunk, then it will also trigger the
-emission of a [`'data'`][] event.
-
-Note that calling [`stream.read([size])`][stream-read] after the [`'end'`][]
-event has been triggered will return `null`. No runtime error will be raised.
-
-#### readable.resume()
-
-* Return: `this`
-
-This method will cause the readable stream to resume emitting [`'data'`][]
-events.
-
-This method will switch the stream into flowing mode. If you do *not*
-want to consume the data from a stream, but you *do* want to get to
-its [`'end'`][] event, you can call [`stream.resume()`][stream-resume] to open
-the flow of data.
-
-```js
-var readable = getReadableStreamSomehow();
-readable.resume();
-readable.on('end', () => {
-  console.log('got to the end, but did not read anything');
-});
-```
-
-#### readable.setEncoding(encoding)
-
-* `encoding` {String} The encoding to use.
-* Return: `this`
-
-Call this function to cause the stream to return strings of the specified
-encoding instead of Buffer objects. For example, if you do
-`readable.setEncoding('utf8')`, then the output data will be interpreted as
-UTF-8 data, and returned as strings. If you do `readable.setEncoding('hex')`,
-then the data will be encoded in hexadecimal string format.
-
-This properly handles multi-byte characters that would otherwise be
-potentially mangled if you simply pulled the Buffers directly and
-called [`buf.toString(encoding)`][] on them. If you want to read the data
-as strings, always use this method.
-
-Also you can disable any encoding at all with `readable.setEncoding(null)`.
-This approach is very useful if you deal with binary data or with large
-multi-byte strings spread out over multiple chunks.
-
-```js
-var readable = getReadableStreamSomehow();
-readable.setEncoding('utf8');
-readable.on('data', (chunk) => {
-  assert.equal(typeof chunk, 'string');
-  console.log('got %d characters of string data', chunk.length);
-});
-```
-
-#### readable.unpipe([destination])
-
-* `destination` {stream.Writable} Optional specific stream to unpipe
-
-This method will remove the hooks set up for a previous [`stream.pipe()`][]
-call.
-
-If the destination is not specified, then all pipes are removed.
-
-If the destination is specified, but no pipe is set up for it, then
-this is a no-op.
-
-```js
-var readable = getReadableStreamSomehow();
-var writable = fs.createWriteStream('file.txt');
-// All the data from readable goes into 'file.txt',
-// but only for the first second
-readable.pipe(writable);
-setTimeout(() => {
-  console.log('stop writing to file.txt');
-  readable.unpipe(writable);
-  console.log('manually close the file stream');
-  writable.end();
-}, 1000);
-```
-
-#### readable.unshift(chunk)
-
-* `chunk` {Buffer|String} Chunk of data to unshift onto the read queue
-
-This is useful in certain cases where a stream is being consumed by a
-parser, which needs to "un-consume" some data that it has
-optimistically pulled out of the source, so that the stream can be
-passed on to some other party.
-
-Note that `stream.unshift(chunk)` cannot be called after the [`'end'`][] event
-has been triggered; a runtime error will be raised.
-
-If you find that you must often call `stream.unshift(chunk)` in your
-programs, consider implementing a [Transform][] stream instead. (See [API
-for Stream Implementors][].)
-
-```js
-// Pull off a header delimited by \n\n
-// use unshift() if we get too much
-// Call the callback with (error, header, stream)
-const StringDecoder = require('string_decoder').StringDecoder;
-function parseHeader(stream, callback) {
-  stream.on('error', callback);
-  stream.on('readable', onReadable);
-  var decoder = new StringDecoder('utf8');
-  var header = '';
-  function onReadable() {
-    var chunk;
-    while (null !== (chunk = stream.read())) {
-      var str = decoder.write(chunk);
-      if (str.match(/\n\n/)) {
-        // found the header boundary
-        var split = str.split(/\n\n/);
-        header += split.shift();
-        var remaining = split.join('\n\n');
-        var buf = new Buffer(remaining, 'utf8');
-        if (buf.length)
-          stream.unshift(buf);
-        stream.removeListener('error', callback);
-        stream.removeListener('readable', onReadable);
-        // now the body of the message can be read from the stream.
-        callback(null, header, stream);
-      } else {
-        // still reading the header.
-        header += str;
-      }
-    }
-  }
-}
-```
-
-Note that, unlike [`stream.push(chunk)`][stream-push], `stream.unshift(chunk)`
-will not end the reading process by resetting the internal reading state of the
-stream. This can cause unexpected results if `unshift()` is called during a
-read (i.e. from within a [`stream._read()`][stream-_read] implementation on a
-custom stream). Following the call to `unshift()` with an immediate
-[`stream.push('')`][stream-push] will reset the reading state appropriately,
-however it is best to simply avoid calling `unshift()` while in the process of
-performing a read.
-
-#### readable.wrap(stream)
-
-* `stream` {Stream} An "old style" readable stream
-
-Versions of Node.js prior to v0.10 had streams that did not implement the
-entire Streams API as it is today. (See [Compatibility][] for
-more information.)
-
-If you are using an older Node.js library that emits [`'data'`][] events and
-has a [`stream.pause()`][stream-pause] method that is advisory only, then you
-can use the `wrap()` method to create a [Readable][] stream that uses the old
-stream as its data source.
-
-You will very rarely ever need to call this function, but it exists
-as a convenience for interacting with old Node.js programs and libraries.
-
-For example:
-
-```js
-const OldReader = require('./old-api-module.js').OldReader;
-const Readable = require('stream').Readable;
-const oreader = new OldReader;
-const myReader = new Readable().wrap(oreader);
-
-myReader.on('readable', () => {
-  myReader.read(); // etc.
-});
-```
-
-### Class: stream.Transform
-
-Transform streams are [Duplex][] streams where the output is in some way
-computed from the input. They implement both the [Readable][] and
-[Writable][] interfaces.
-
-Examples of Transform streams include:
-
-* [zlib streams][zlib]
-* [crypto streams][crypto]
-
-### Class: stream.Writable
-
-<!--type=class-->
-
-The Writable stream interface is an abstraction for a *destination*
-that you are writing data *to*.
-
-Examples of writable streams include:
-
-* [HTTP requests, on the client][]
-* [HTTP responses, on the server][]
-* [fs write streams][]
-* [zlib streams][zlib]
-* [crypto streams][crypto]
-* [TCP sockets][]
-* [child process stdin][]
-* [`process.stdout`][], [`process.stderr`][]
-
-#### Event: 'drain'
-
-If a [`stream.write(chunk)`][stream-write] call returns `false`, then the
-`'drain'` event will indicate when it is appropriate to begin writing more data
-to the stream.
-
-```js
-// Write the data to the supplied writable stream one million times.
-// Be attentive to back-pressure.
-function writeOneMillionTimes(writer, data, encoding, callback) {
-  var i = 1000000;
-  write();
-  function write() {
-    var ok = true;
-    do {
-      i -= 1;
-      if (i === 0) {
-        // last time!
-        writer.write(data, encoding, callback);
-      } else {
-        // see if we should continue, or wait
-        // don't pass the callback, because we're not done yet.
-        ok = writer.write(data, encoding);
-      }
-    } while (i > 0 && ok);
-    if (i > 0) {
-      // had to stop early!
-      // write some more once it drains
-      writer.once('drain', write);
-    }
-  }
-}
-```
-
-#### Event: 'error'
-
-* {Error}
-
-Emitted if there was an error when writing or piping data.
-
-#### Event: 'finish'
-
-When the [`stream.end()`][stream-end] method has been called, and all data has
-been flushed to the underlying system, this event is emitted.
-
-```javascript
-var writer = getWritableStreamSomehow();
-for (var i = 0; i < 100; i ++) {
-  writer.write('hello, #${i}!\n');
-}
-writer.end('this is the end\n');
-writer.on('finish', () => {
-  console.error('all writes are now complete.');
-});
-```
-
-#### Event: 'pipe'
-
-* `src` {stream.Readable} source stream that is piping to this writable
-
-This is emitted whenever the [`stream.pipe()`][] method is called on a readable
-stream, adding this writable to its set of destinations.
-
-```js
-var writer = getWritableStreamSomehow();
-var reader = getReadableStreamSomehow();
-writer.on('pipe', (src) => {
-  console.error('something is piping into the writer');
-  assert.equal(src, reader);
-});
-reader.pipe(writer);
-```
-
-#### Event: 'unpipe'
-
-* `src` {[Readable][] Stream} The source stream that
-  [unpiped][`stream.unpipe()`] this writable
-
-This is emitted whenever the [`stream.unpipe()`][] method is called on a
-readable stream, removing this writable from its set of destinations.
-
-```js
-var writer = getWritableStreamSomehow();
-var reader = getReadableStreamSomehow();
-writer.on('unpipe', (src) => {
-  console.error('something has stopped piping into the writer');
-  assert.equal(src, reader);
-});
-reader.pipe(writer);
-reader.unpipe(writer);
-```
-
-#### writable.cork()
-
-Forces buffering of all writes.
-
-Buffered data will be flushed either at [`stream.uncork()`][] or at
-[`stream.end()`][stream-end] call.
-
-#### writable.end([chunk][, encoding][, callback])
-
-* `chunk` {String|Buffer} Optional data to write
-* `encoding` {String} The encoding, if `chunk` is a String
-* `callback` {Function} Optional callback for when the stream is finished
-
-Call this method when no more data will be written to the stream. If supplied,
-the callback is attached as a listener on the [`'finish'`][] event.
-
-Calling [`stream.write()`][stream-write] after calling
-[`stream.end()`][stream-end] will raise an error.
-
-```js
-// write 'hello, ' and then end with 'world!'
-var file = fs.createWriteStream('example.txt');
-file.write('hello, ');
-file.end('world!');
-// writing more now is not allowed!
-```
-
-#### writable.setDefaultEncoding(encoding)
-
-* `encoding` {String} The new default encoding
-
-Sets the default encoding for a writable stream.
-
-#### writable.uncork()
-
-Flush all data, buffered since [`stream.cork()`][] call.
-
-#### writable.write(chunk[, encoding][, callback])
-
-* `chunk` {String|Buffer} The data to write
-* `encoding` {String} The encoding, if `chunk` is a String
-* `callback` {Function} Callback for when this chunk of data is flushed
-* Returns: {Boolean} `true` if the data was handled completely.
-
-This method writes some data to the underlying system, and calls the
-supplied callback once the data has been fully handled.
-
-The return value indicates if you should continue writing right now.
-If the data had to be buffered internally, then it will return
-`false`. Otherwise, it will return `true`.
-
-This return value is strictly advisory. You MAY continue to write,
-even if it returns `false`. However, writes will be buffered in
-memory, so it is best not to do this excessively. Instead, wait for
-the [`'drain'`][] event before writing more data.
-
-
-## API for Stream Implementors
-
-<!--type=misc-->
-
-To implement any sort of stream, the pattern is the same:
-
-1. Extend the appropriate parent class in your own subclass. (The
-   [`util.inherits()`][] method is particularly helpful for this.)
-2. Call the appropriate parent class constructor in your constructor,
-   to be sure that the internal mechanisms are set up properly.
-3. Implement one or more specific methods, as detailed below.
-
-The class to extend and the method(s) to implement depend on the sort
-of stream class you are writing:
-
-<table>
-  <thead>
-    <tr>
-      <th>
-        <p>Use-case</p>
-      </th>
-      <th>
-        <p>Class</p>
-      </th>
-      <th>
-        <p>Method(s) to implement</p>
-      </th>
-    </tr>
-  </thead>
-  <tr>
-    <td>
-      <p>Reading only</p>
-    </td>
-    <td>
-      <p>[Readable](#stream_class_stream_readable_1)</p>
-    </td>
-    <td>
-      <p><code>[_read][stream-_read]</code></p>
-    </td>
-  </tr>
-  <tr>
-    <td>
-      <p>Writing only</p>
-    </td>
-    <td>
-      <p>[Writable](#stream_class_stream_writable_1)</p>
-    </td>
-    <td>
-      <p><code>[_write][stream-_write]</code>, <code>[_writev][stream-_writev]</code></p>
-    </td>
-  </tr>
-  <tr>
-    <td>
-      <p>Reading and writing</p>
-    </td>
-    <td>
-      <p>[Duplex](#stream_class_stream_duplex_1)</p>
-    </td>
-    <td>
-      <p><code>[_read][stream-_read]</code>, <code>[_write][stream-_write]</code>, <code>[_writev][stream-_writev]</code></p>
-    </td>
-  </tr>
-  <tr>
-    <td>
-      <p>Operate on written data, then read the result</p>
-    </td>
-    <td>
-      <p>[Transform](#stream_class_stream_transform_1)</p>
-    </td>
-    <td>
-      <p><code>[_transform][stream-_transform]</code>, <code>[_flush][stream-_flush]</code></p>
-    </td>
-  </tr>
-</table>
-
-In your implementation code, it is very important to never call the methods
-described in [API for Stream Consumers][]. Otherwise, you can potentially cause
-adverse side effects in programs that consume your streaming interfaces.
-
-### Class: stream.Duplex
-
-<!--type=class-->
-
-A "duplex" stream is one that is both Readable and Writable, such as a TCP
-socket connection.
-
-Note that `stream.Duplex` is an abstract class designed to be extended
-with an underlying implementation of the [`stream._read(size)`][stream-_read]
-and [`stream._write(chunk, encoding, callback)`][stream-_write] methods as you
-would with a Readable or Writable stream class.
-
-Since JavaScript doesn't have multiple prototypal inheritance, this class
-prototypally inherits from Readable, and then parasitically from Writable. It is
-thus up to the user to implement both the low-level
-[`stream._read(n)`][stream-_read] method as well as the low-level
-[`stream._write(chunk, encoding, callback)`][stream-_write] method on extension
-duplex classes.
-
-#### new stream.Duplex(options)
-
-* `options` {Object} Passed to both Writable and Readable
-  constructors. Also has the following fields:
-  * `allowHalfOpen` {Boolean} Default = `true`. If set to `false`, then
-    the stream will automatically end the readable side when the
-    writable side ends and vice versa.
-  * `readableObjectMode` {Boolean} Default = `false`. Sets `objectMode`
-    for readable side of the stream. Has no effect if `objectMode`
-    is `true`.
-  * `writableObjectMode` {Boolean} Default = `false`. Sets `objectMode`
-    for writable side of the stream. Has no effect if `objectMode`
-    is `true`.
-
-In classes that extend the Duplex class, make sure to call the
-constructor so that the buffering settings can be properly
-initialized.
-
-### Class: stream.PassThrough
-
-This is a trivial implementation of a [Transform][] stream that simply
-passes the input bytes across to the output. Its purpose is mainly
-for examples and testing, but there are occasionally use cases where
-it can come in handy as a building block for novel sorts of streams.
-
-### Class: stream.Readable
-
-<!--type=class-->
-
-`stream.Readable` is an abstract class designed to be extended with an
-underlying implementation of the [`stream._read(size)`][stream-_read] method.
-
-Please see [API for Stream Consumers][] for how to consume
-streams in your programs. What follows is an explanation of how to
-implement Readable streams in your programs.
-
-#### new stream.Readable([options])
-
-* `options` {Object}
-  * `highWaterMark` {Number} The maximum number of bytes to store in
-    the internal buffer before ceasing to read from the underlying
-    resource. Default = `16384` (16kb), or `16` for `objectMode` streams
-  * `encoding` {String} If specified, then buffers will be decoded to
-    strings using the specified encoding. Default = `null`
-  * `objectMode` {Boolean} Whether this stream should behave
-    as a stream of objects. Meaning that [`stream.read(n)`][stream-read] returns
-    a single value instead of a Buffer of size n. Default = `false`
-  * `read` {Function} Implementation for the [`stream._read()`][stream-_read]
-    method.
-
-In classes that extend the Readable class, make sure to call the
-Readable constructor so that the buffering settings can be properly
-initialized.
-
-#### readable.\_read(size)
-
-* `size` {Number} Number of bytes to read asynchronously
-
-Note: **Implement this method, but do NOT call it directly.**
-
-This method is prefixed with an underscore because it is internal to the
-class that defines it and should only be called by the internal Readable
-class methods. All Readable stream implementations must provide a \_read
-method to fetch data from the underlying resource.
-
-When `_read()` is called, if data is available from the resource, the `_read()`
-implementation should start pushing that data into the read queue by calling
-[`this.push(dataChunk)`][stream-push]. `_read()` should continue reading from
-the resource and pushing data until push returns `false`, at which point it
-should stop reading from the resource. Only when `_read()` is called again after
-it has stopped should it start reading more data from the resource and pushing
-that data onto the queue.
-
-Note: once the `_read()` method is called, it will not be called again until
-the [`stream.push()`][stream-push] method is called.
-
-The `size` argument is advisory. Implementations where a "read" is a
-single call that returns data can use this to know how much data to
-fetch. Implementations where that is not relevant, such as TCP or
-TLS, may ignore this argument, and simply provide data whenever it
-becomes available. There is no need, for example to "wait" until
-`size` bytes are available before calling [`stream.push(chunk)`][stream-push].
-
-#### readable.push(chunk[, encoding])
-
-
-* `chunk` {Buffer|Null|String} Chunk of data to push into the read queue
-* `encoding` {String} Encoding of String chunks.  Must be a valid
-  Buffer encoding, such as `'utf8'` or `'ascii'`
-* return {Boolean} Whether or not more pushes should be performed
-
-Note: **This method should be called by Readable implementors, NOT
-by consumers of Readable streams.**
-
-If a value other than null is passed, The `push()` method adds a chunk of data
-into the queue for subsequent stream processors to consume. If `null` is
-passed, it signals the end of the stream (EOF), after which no more data
-can be written.
-
-The data added with `push()` can be pulled out by calling the
-[`stream.read()`][stream-read] method when the [`'readable'`][] event fires.
-
-This API is designed to be as flexible as possible. For example,
-you may be wrapping a lower-level source which has some sort of
-pause/resume mechanism, and a data callback. In those cases, you
-could wrap the low-level source object by doing something like this:
-
-```js
-// source is an object with readStop() and readStart() methods,
-// and an `ondata` member that gets called when it has data, and
-// an `onend` member that gets called when the data is over.
-
-util.inherits(SourceWrapper, Readable);
-
-function SourceWrapper(options) {
-  Readable.call(this, options);
-
-  this._source = getLowlevelSourceObject();
-
-  // Every time there's data, we push it into the internal buffer.
-  this._source.ondata = (chunk) => {
-    // if push() returns false, then we need to stop reading from source
-    if (!this.push(chunk))
-      this._source.readStop();
-  };
-
-  // When the source ends, we push the EOF-signaling `null` chunk
-  this._source.onend = () => {
-    this.push(null);
-  };
-}
-
-// _read will be called when the stream wants to pull more data in
-// the advisory size argument is ignored in this case.
-SourceWrapper.prototype._read = function(size) {
-  this._source.readStart();
-};
-```
-
-#### Example: A Counting Stream
-
-<!--type=example-->
-
-This is a basic example of a Readable stream. It emits the numerals
-from 1 to 1,000,000 in ascending order, and then ends.
-
-```js
-const Readable = require('stream').Readable;
-const util = require('util');
-util.inherits(Counter, Readable);
-
-function Counter(opt) {
-  Readable.call(this, opt);
-  this._max = 1000000;
-  this._index = 1;
-}
-
-Counter.prototype._read = function() {
-  var i = this._index++;
-  if (i > this._max)
-    this.push(null);
-  else {
-    var str = '' + i;
-    var buf = new Buffer(str, 'ascii');
-    this.push(buf);
-  }
-};
-```
-
-#### Example: SimpleProtocol v1 (Sub-optimal)
-
-This is similar to the `parseHeader` function described
-[here](#stream_readable_unshift_chunk), but implemented as a custom stream.
-Also, note that this implementation does not convert the incoming data to a
-string.
-
-However, this would be better implemented as a [Transform][] stream. See
-[SimpleProtocol v2][] for a better implementation.
-
-```js
-// A parser for a simple data protocol.
-// The "header" is a JSON object, followed by 2 \n characters, and
-// then a message body.
-//
-// NOTE: This can be done more simply as a Transform stream!
-// Using Readable directly for this is sub-optimal. See the
-// alternative example below under the Transform section.
-
-const Readable = require('stream').Readable;
-const util = require('util');
-
-util.inherits(SimpleProtocol, Readable);
-
-function SimpleProtocol(source, options) {
-  if (!(this instanceof SimpleProtocol))
-    return new SimpleProtocol(source, options);
-
-  Readable.call(this, options);
-  this._inBody = false;
-  this._sawFirstCr = false;
-
-  // source is a readable stream, such as a socket or file
-  this._source = source;
-
-  var self = this;
-  source.on('end', () => {
-    self.push(null);
-  });
-
-  // give it a kick whenever the source is readable
-  // read(0) will not consume any bytes
-  source.on('readable', () => {
-    self.read(0);
-  });
-
-  this._rawHeader = [];
-  this.header = null;
-}
-
-SimpleProtocol.prototype._read = function(n) {
-  if (!this._inBody) {
-    var chunk = this._source.read();
-
-    // if the source doesn't have data, we don't have data yet.
-    if (chunk === null)
-      return this.push('');
-
-    // check if the chunk has a \n\n
-    var split = -1;
-    for (var i = 0; i < chunk.length; i++) {
-      if (chunk[i] === 10) { // '\n'
-        if (this._sawFirstCr) {
-          split = i;
-          break;
-        } else {
-          this._sawFirstCr = true;
-        }
-      } else {
-        this._sawFirstCr = false;
-      }
-    }
-
-    if (split === -1) {
-      // still waiting for the \n\n
-      // stash the chunk, and try again.
-      this._rawHeader.push(chunk);
-      this.push('');
-    } else {
-      this._inBody = true;
-      var h = chunk.slice(0, split);
-      this._rawHeader.push(h);
-      var header = Buffer.concat(this._rawHeader).toString();
-      try {
-        this.header = JSON.parse(header);
-      } catch (er) {
-        this.emit('error', new Error('invalid simple protocol data'));
-        return;
-      }
-      // now, because we got some extra data, unshift the rest
-      // back into the read queue so that our consumer will see it.
-      var b = chunk.slice(split);
-      this.unshift(b);
-      // calling unshift by itself does not reset the reading state
-      // of the stream; since we're inside _read, doing an additional
-      // push('') will reset the state appropriately.
-      this.push('');
-
-      // and let them know that we are done parsing the header.
-      this.emit('header', this.header);
-    }
-  } else {
-    // from there on, just provide the data to our consumer.
-    // careful not to push(null), since that would indicate EOF.
-    var chunk = this._source.read();
-    if (chunk) this.push(chunk);
-  }
-};
-
-// Usage:
-// var parser = new SimpleProtocol(source);
-// Now parser is a readable stream that will emit 'header'
-// with the parsed header data.
-```
-
-### Class: stream.Transform
-
-A "transform" stream is a duplex stream where the output is causally
-connected in some way to the input, such as a [zlib][] stream or a
-[crypto][] stream.
-
-There is no requirement that the output be the same size as the input,
-the same number of chunks, or arrive at the same time. For example, a
-Hash stream will only ever have a single chunk of output which is
-provided when the input is ended. A zlib stream will produce output
-that is either much smaller or much larger than its input.
-
-Rather than implement the [`stream._read()`][stream-_read] and
-[`stream._write()`][stream-_write] methods, Transform classes must implement the
-[`stream._transform()`][stream-_transform] method, and may optionally
-also implement the [`stream._flush()`][stream-_flush] method. (See below.)
-
-#### new stream.Transform([options])
-
-* `options` {Object} Passed to both Writable and Readable
-  constructors. Also has the following fields:
-  * `transform` {Function} Implementation for the
-    [`stream._transform()`][stream-_transform] method.
-  * `flush` {Function} Implementation for the [`stream._flush()`][stream-_flush]
-    method.
-
-In classes that extend the Transform class, make sure to call the
-constructor so that the buffering settings can be properly
-initialized.
-
-#### Events: 'finish' and 'end'
-
-The [`'finish'`][] and [`'end'`][] events are from the parent Writable
-and Readable classes respectively. The `'finish'` event is fired after
-[`stream.end()`][stream-end] is called and all chunks have been processed by
-[`stream._transform()`][stream-_transform], `'end'` is fired after all data has
-been output which is after the callback in [`stream._flush()`][stream-_flush]
-has been called.
-
-#### transform.\_flush(callback)
-
-* `callback` {Function} Call this function (optionally with an error
-  argument) when you are done flushing any remaining data.
-
-Note: **This function MUST NOT be called directly.**  It MAY be implemented
-by child classes, and if so, will be called by the internal Transform
-class methods only.
-
-In some cases, your transform operation may need to emit a bit more
-data at the end of the stream. For example, a `Zlib` compression
-stream will store up some internal state so that it can optimally
-compress the output. At the end, however, it needs to do the best it
-can with what is left, so that the data will be complete.
-
-In those cases, you can implement a `_flush()` method, which will be
-called at the very end, after all the written data is consumed, but
-before emitting [`'end'`][] to signal the end of the readable side. Just
-like with [`stream._transform()`][stream-_transform], call
-`transform.push(chunk)` zero or more times, as appropriate, and call `callback`
-when the flush operation is complete.
-
-This method is prefixed with an underscore because it is internal to
-the class that defines it, and should not be called directly by user
-programs. However, you **are** expected to override this method in
-your own extension classes.
-
-#### transform.\_transform(chunk, encoding, callback)
-
-* `chunk` {Buffer|String} The chunk to be transformed. Will **always**
-  be a buffer unless the `decodeStrings` option was set to `false`.
-* `encoding` {String} If the chunk is a string, then this is the
-  encoding type. If chunk is a buffer, then this is the special
-  value - 'buffer', ignore it in this case.
-* `callback` {Function} Call this function (optionally with an error
-  argument and data) when you are done processing the supplied chunk.
-
-Note: **This function MUST NOT be called directly.**  It should be
-implemented by child classes, and called by the internal Transform
-class methods only.
-
-All Transform stream implementations must provide a `_transform()`
-method to accept input and produce output.
-
-`_transform()` should do whatever has to be done in this specific
-Transform class, to handle the bytes being written, and pass them off
-to the readable portion of the interface. Do asynchronous I/O,
-process things, and so on.
-
-Call `transform.push(outputChunk)` 0 or more times to generate output
-from this input chunk, depending on how much data you want to output
-as a result of this chunk.
-
-Call the callback function only when the current chunk is completely
-consumed. Note that there may or may not be output as a result of any
-particular input chunk. If you supply a second argument to the callback
-it will be passed to the push method. In other words the following are
-equivalent:
-
-```js
-transform.prototype._transform = function (data, encoding, callback) {
-  this.push(data);
-  callback();
-};
-
-transform.prototype._transform = function (data, encoding, callback) {
-  callback(null, data);
-};
-```
-
-This method is prefixed with an underscore because it is internal to
-the class that defines it, and should not be called directly by user
-programs. However, you **are** expected to override this method in
-your own extension classes.
-
-#### Example: `SimpleProtocol` parser v2
-
-The example [here](#stream_example_simpleprotocol_v1_sub_optimal) of a simple
-protocol parser can be implemented simply by using the higher level
-[Transform][] stream class, similar to the `parseHeader` and `SimpleProtocol
-v1` examples.
-
-In this example, rather than providing the input as an argument, it
-would be piped into the parser, which is a more idiomatic Node.js stream
-approach.
-
-```javascript
-const util = require('util');
-const Transform = require('stream').Transform;
-util.inherits(SimpleProtocol, Transform);
-
-function SimpleProtocol(options) {
-  if (!(this instanceof SimpleProtocol))
-    return new SimpleProtocol(options);
-
-  Transform.call(this, options);
-  this._inBody = false;
-  this._sawFirstCr = false;
-  this._rawHeader = [];
-  this.header = null;
-}
-
-SimpleProtocol.prototype._transform = function(chunk, encoding, done) {
-  if (!this._inBody) {
-    // check if the chunk has a \n\n
-    var split = -1;
-    for (var i = 0; i < chunk.length; i++) {
-      if (chunk[i] === 10) { // '\n'
-        if (this._sawFirstCr) {
-          split = i;
-          break;
-        } else {
-          this._sawFirstCr = true;
-        }
-      } else {
-        this._sawFirstCr = false;
-      }
-    }
-
-    if (split === -1) {
-      // still waiting for the \n\n
-      // stash the chunk, and try again.
-      this._rawHeader.push(chunk);
-    } else {
-      this._inBody = true;
-      var h = chunk.slice(0, split);
-      this._rawHeader.push(h);
-      var header = Buffer.concat(this._rawHeader).toString();
-      try {
-        this.header = JSON.parse(header);
-      } catch (er) {
-        this.emit('error', new Error('invalid simple protocol data'));
-        return;
-      }
-      // and let them know that we are done parsing the header.
-      this.emit('header', this.header);
-
-      // now, because we got some extra data, emit this first.
-      this.push(chunk.slice(split));
-    }
-  } else {
-    // from there on, just provide the data to our consumer as-is.
-    this.push(chunk);
-  }
-  done();
-};
-
-// Usage:
-// var parser = new SimpleProtocol();
-// source.pipe(parser)
-// Now parser is a readable stream that will emit 'header'
-// with the parsed header data.
-```
-
-### Class: stream.Writable
-
-<!--type=class-->
-
-`stream.Writable` is an abstract class designed to be extended with an
-underlying implementation of the
-[`stream._write(chunk, encoding, callback)`][stream-_write] method.
-
-Please see [API for Stream Consumers][] for how to consume
-writable streams in your programs. What follows is an explanation of
-how to implement Writable streams in your programs.
-
-#### new stream.Writable([options])
-
-* `options` {Object}
-  * `highWaterMark` {Number} Buffer level when
-    [`stream.write()`][stream-write] starts returning `false`. Default = `16384`
-    (16kb), or `16` for `objectMode` streams.
-  * `decodeStrings` {Boolean} Whether or not to decode strings into
-    Buffers before passing them to [`stream._write()`][stream-_write].
-    Default = `true`
-  * `objectMode` {Boolean} Whether or not the
-    [`stream.write(anyObj)`][stream-write] is a valid operation. If set you can
-    write arbitrary data instead of only `Buffer` / `String` data.
-    Default = `false`
-  * `write` {Function} Implementation for the
-    [`stream._write()`][stream-_write] method.
-  * `writev` {Function} Implementation for the
-    [`stream._writev()`][stream-_writev] method.
-
-In classes that extend the Writable class, make sure to call the
-constructor so that the buffering settings can be properly
-initialized.
-
-#### writable.\_write(chunk, encoding, callback)
-
-* `chunk` {Buffer|String} The chunk to be written. Will **always**
-  be a buffer unless the `decodeStrings` option was set to `false`.
-* `encoding` {String} If the chunk is a string, then this is the
-  encoding type. If chunk is a buffer, then this is the special
-  value - 'buffer', ignore it in this case.
-* `callback` {Function} Call this function (optionally with an error
-  argument) when you are done processing the supplied chunk.
-
-All Writable stream implementations must provide a
-[`stream._write()`][stream-_write] method to send data to the underlying
-resource.
-
-Note: **This function MUST NOT be called directly.**  It should be
-implemented by child classes, and called by the internal Writable
-class methods only.
-
-Call the callback using the standard `callback(error)` pattern to
-signal that the write completed successfully or with an error.
-
-If the `decodeStrings` flag is set in the constructor options, then
-`chunk` may be a string rather than a Buffer, and `encoding` will
-indicate the sort of string that it is. This is to support
-implementations that have an optimized handling for certain string
-data encodings. If you do not explicitly set the `decodeStrings`
-option to `false`, then you can safely ignore the `encoding` argument,
-and assume that `chunk` will always be a Buffer.
-
-This method is prefixed with an underscore because it is internal to
-the class that defines it, and should not be called directly by user
-programs. However, you **are** expected to override this method in
-your own extension classes.
-
-#### writable.\_writev(chunks, callback)
-
-* `chunks` {Array} The chunks to be written. Each chunk has following
-  format: `{ chunk: ..., encoding: ... }`.
-* `callback` {Function} Call this function (optionally with an error
-  argument) when you are done processing the supplied chunks.
-
-Note: **This function MUST NOT be called directly.**  It may be
-implemented by child classes, and called by the internal Writable
-class methods only.
-
-This function is completely optional to implement. In most cases it is
-unnecessary. If implemented, it will be called with all the chunks
-that are buffered in the write queue.
-
-
-## Simplified Constructor API
-
-<!--type=misc-->
-
-In simple cases there is now the added benefit of being able to construct a
-stream without inheritance.
-
-This can be done by passing the appropriate methods as constructor options:
-
-Examples:
-
-### Duplex
-
-```js
-var duplex = new stream.Duplex({
-  read: function(n) {
-    // sets this._read under the hood
-
-    // push data onto the read queue, passing null
-    // will signal the end of the stream (EOF)
-    this.push(chunk);
-  },
-  write: function(chunk, encoding, next) {
-    // sets this._write under the hood
-
-    // An optional error can be passed as the first argument
-    next()
-  }
-});
-
-// or
-
-var duplex = new stream.Duplex({
-  read: function(n) {
-    // sets this._read under the hood
-
-    // push data onto the read queue, passing null
-    // will signal the end of the stream (EOF)
-    this.push(chunk);
-  },
-  writev: function(chunks, next) {
-    // sets this._writev under the hood
-
-    // An optional error can be passed as the first argument
-    next()
-  }
-});
-```
-
-### Readable
-
-```js
-var readable = new stream.Readable({
-  read: function(n) {
-    // sets this._read under the hood
-
-    // push data onto the read queue, passing null
-    // will signal the end of the stream (EOF)
-    this.push(chunk);
-  }
-});
-```
-
-### Transform
-
-```js
-var transform = new stream.Transform({
-  transform: function(chunk, encoding, next) {
-    // sets this._transform under the hood
-
-    // generate output as many times as needed
-    // this.push(chunk);
-
-    // call when the current chunk is consumed
-    next();
-  },
-  flush: function(done) {
-    // sets this._flush under the hood
-
-    // generate output as many times as needed
-    // this.push(chunk);
-
-    done();
-  }
-});
-```
-
-### Writable
-
-```js
-var writable = new stream.Writable({
-  write: function(chunk, encoding, next) {
-    // sets this._write under the hood
-
-    // An optional error can be passed as the first argument
-    next()
-  }
-});
-
-// or
-
-var writable = new stream.Writable({
-  writev: function(chunks, next) {
-    // sets this._writev under the hood
-
-    // An optional error can be passed as the first argument
-    next()
-  }
-});
-```
-
-## Streams: Under the Hood
-
-<!--type=misc-->
-
-### Buffering
-
-<!--type=misc-->
-
-Both Writable and Readable streams will buffer data on an internal
-object which can be retrieved from `_writableState.getBuffer()` or
-`_readableState.buffer`, respectively.
-
-The amount of data that will potentially be buffered depends on the
-`highWaterMark` option which is passed into the constructor.
-
-Buffering in Readable streams happens when the implementation calls
-[`stream.push(chunk)`][stream-push]. If the consumer of the Stream does not
-call [`stream.read()`][stream-read], then the data will sit in the internal
-queue until it is consumed.
-
-Buffering in Writable streams happens when the user calls
-[`stream.write(chunk)`][stream-write] repeatedly, even when it returns `false`.
-
-The purpose of streams, especially with the [`stream.pipe()`][] method, is to
-limit the buffering of data to acceptable levels, so that sources and
-destinations of varying speed will not overwhelm the available memory.
-
-### Compatibility with Older Node.js Versions
-
-<!--type=misc-->
-
-In versions of Node.js prior to v0.10, the Readable stream interface was
-simpler, but also less powerful and less useful.
-
-* Rather than waiting for you to call the [`stream.read()`][stream-read] method,
-  [`'data'`][] events would start emitting immediately. If you needed to do
-  some I/O to decide how to handle data, then you had to store the chunks
-  in some kind of buffer so that they would not be lost.
-* The [`stream.pause()`][stream-pause] method was advisory, rather than
-  guaranteed. This meant that you still had to be prepared to receive
-  [`'data'`][] events even when the stream was in a paused state.
-
-In Node.js v0.10, the [Readable][] class was added.
-For backwards compatibility with older Node.js programs, Readable streams
-switch into "flowing mode" when a [`'data'`][] event handler is added, or
-when the [`stream.resume()`][stream-resume] method is called. The effect is
-that, even if you are not using the new [`stream.read()`][stream-read] method
-and [`'readable'`][] event, you no longer have to worry about losing
-[`'data'`][] chunks.
-
-Most programs will continue to function normally. However, this
-introduces an edge case in the following conditions:
-
-* No [`'data'`][] event handler is added.
-* The [`stream.resume()`][stream-resume] method is never called.
-* The stream is not piped to any writable destination.
-
-For example, consider the following code:
-
-```js
-// WARNING!  BROKEN!
-net.createServer((socket) => {
-
-  // we add an 'end' method, but never consume the data
-  socket.on('end', () => {
-    // It will never get here.
-    socket.end('I got your message (but didnt read it)\n');
-  });
-
-}).listen(1337);
-```
-
-In versions of Node.js prior to v0.10, the incoming message data would be
-simply discarded. However, in Node.js v0.10 and beyond,
-the socket will remain paused forever.
-
-The workaround in this situation is to call the
-[`stream.resume()`][stream-resume] method to start the flow of data:
-
-```js
-// Workaround
-net.createServer((socket) => {
-
-  socket.on('end', () => {
-    socket.end('I got your message (but didnt read it)\n');
-  });
-
-  // start the flow of data, discarding it.
-  socket.resume();
-
-}).listen(1337);
-```
-
-In addition to new Readable streams switching into flowing mode,
-pre-v0.10 style streams can be wrapped in a Readable class using the
-[`stream.wrap()`][] method.
-
-
-### Object Mode
-
-<!--type=misc-->
-
-Normally, Streams operate on Strings and Buffers exclusively.
-
-Streams that are in **object mode** can emit generic JavaScript values
-other than Buffers and Strings.
-
-A Readable stream in object mode will always return a single item from
-a call to [`stream.read(size)`][stream-read], regardless of what the size
-argument is.
-
-A Writable stream in object mode will always ignore the `encoding`
-argument to [`stream.write(data, encoding)`][stream-write].
-
-The special value `null` still retains its special value for object
-mode streams. That is, for object mode readable streams, `null` as a
-return value from [`stream.read()`][stream-read] indicates that there is no more
-data, and [`stream.push(null)`][stream-push] will signal the end of stream data
-(`EOF`).
-
-No streams in Node.js core are object mode streams. This pattern is only
-used by userland streaming libraries.
-
-You should set `objectMode` in your stream child class constructor on
-the options object. Setting `objectMode` mid-stream is not safe.
-
-For Duplex streams `objectMode` can be set exclusively for readable or
-writable side with `readableObjectMode` and `writableObjectMode`
-respectively. These options can be used to implement parsers and
-serializers with Transform streams.
-
-```js
-const util = require('util');
-const StringDecoder = require('string_decoder').StringDecoder;
-const Transform = require('stream').Transform;
-util.inherits(JSONParseStream, Transform);
-
-// Gets \n-delimited JSON string data, and emits the parsed objects
-function JSONParseStream() {
-  if (!(this instanceof JSONParseStream))
-    return new JSONParseStream();
-
-  Transform.call(this, { readableObjectMode : true });
-
-  this._buffer = '';
-  this._decoder = new StringDecoder('utf8');
-}
-
-JSONParseStream.prototype._transform = function(chunk, encoding, cb) {
-  this._buffer += this._decoder.write(chunk);
-  // split on newlines
-  var lines = this._buffer.split(/\r?\n/);
-  // keep the last partial line buffered
-  this._buffer = lines.pop();
-  for (var l = 0; l < lines.length; l++) {
-    var line = lines[l];
-    try {
-      var obj = JSON.parse(line);
-    } catch (er) {
-      this.emit('error', er);
-      return;
-    }
-    // push the parsed object out to the readable consumer
-    this.push(obj);
-  }
-  cb();
-};
-
-JSONParseStream.prototype._flush = function(cb) {
-  // Just handle any leftover
-  var rem = this._buffer.trim();
-  if (rem) {
-    try {
-      var obj = JSON.parse(rem);
-    } catch (er) {
-      this.emit('error', er);
-      return;
-    }
-    // push the parsed object out to the readable consumer
-    this.push(obj);
-  }
-  cb();
-};
-```
-
-### `stream.read(0)`
-
-There are some cases where you want to trigger a refresh of the
-underlying readable stream mechanisms, without actually consuming any
-data. In that case, you can call `stream.read(0)`, which will always
-return null.
-
-If the internal read buffer is below the `highWaterMark`, and the
-stream is not currently reading, then calling `stream.read(0)` will trigger
-a low-level [`stream._read()`][stream-_read] call.
-
-There is almost never a need to do this. However, you will see some
-cases in Node.js's internals where this is done, particularly in the
-Readable stream class internals.
-
-### `stream.push('')`
-
-Pushing a zero-byte string or Buffer (when not in [Object mode][]) has an
-interesting side effect. Because it *is* a call to
-[`stream.push()`][stream-push], it will end the `reading` process. However, it
-does *not* add any data to the readable buffer, so there's nothing for
-a user to consume.
-
-Very rarely, there are cases where you have no data to provide now,
-but the consumer of your stream (or, perhaps, another bit of your own
-code) will know when to check again, by calling [`stream.read(0)`][stream-read].
-In those cases, you *may* call `stream.push('')`.
-
-So far, the only use case for this functionality is in the
-[`tls.CryptoStream`][] class, which is deprecated in Node.js/io.js v1.0. If you
-find that you have to use `stream.push('')`, please consider another
-approach, because it almost certainly indicates that something is
-horribly wrong.
-
-[`'data'`]: #stream_event_data
-[`'drain'`]: #stream_event_drain
-[`'end'`]: #stream_event_end
-[`'finish'`]: #stream_event_finish
-[`'readable'`]: #stream_event_readable
-[`buf.toString(encoding)`]: https://nodejs.org/docs/v5.8.0/api/buffer.html#buffer_buf_tostring_encoding_start_end
-[`EventEmitter`]: https://nodejs.org/docs/v5.8.0/api/events.html#events_class_eventemitter
-[`process.stderr`]: https://nodejs.org/docs/v5.8.0/api/process.html#process_process_stderr
-[`process.stdin`]: https://nodejs.org/docs/v5.8.0/api/process.html#process_process_stdin
-[`process.stdout`]: https://nodejs.org/docs/v5.8.0/api/process.html#process_process_stdout
-[`stream.cork()`]: #stream_writable_cork
-[`stream.pipe()`]: #stream_readable_pipe_destination_options
-[`stream.uncork()`]: #stream_writable_uncork
-[`stream.unpipe()`]: #stream_readable_unpipe_destination
-[`stream.wrap()`]: #stream_readable_wrap_stream
-[`tls.CryptoStream`]: https://nodejs.org/docs/v5.8.0/api/tls.html#tls_class_cryptostream
-[`util.inherits()`]: https://nodejs.org/docs/v5.8.0/api/util.html#util_util_inherits_constructor_superconstructor
-[API for Stream Consumers]: #stream_api_for_stream_consumers
-[API for Stream Implementors]: #stream_api_for_stream_implementors
-[child process stdin]: https://nodejs.org/docs/v5.8.0/api/child_process.html#child_process_child_stdin
-[child process stdout and stderr]: https://nodejs.org/docs/v5.8.0/api/child_process.html#child_process_child_stdout
-[Compatibility]: #stream_compatibility_with_older_node_js_versions
-[crypto]: crypto.html
-[Duplex]: #stream_class_stream_duplex
-[fs read streams]: https://nodejs.org/docs/v5.8.0/api/fs.html#fs_class_fs_readstream
-[fs write streams]: https://nodejs.org/docs/v5.8.0/api/fs.html#fs_class_fs_writestream
-[HTTP requests, on the client]: https://nodejs.org/docs/v5.8.0/api/http.html#http_class_http_clientrequest
-[HTTP responses, on the server]: https://nodejs.org/docs/v5.8.0/api/http.html#http_class_http_serverresponse
-[http-incoming-message]: https://nodejs.org/docs/v5.8.0/api/http.html#http_class_http_incomingmessage
-[Object mode]: #stream_object_mode
-[Readable]: #stream_class_stream_readable
-[SimpleProtocol v2]: #stream_example_simpleprotocol_parser_v2
-[stream-_flush]: #stream_transform_flush_callback
-[stream-_read]: #stream_readable_read_size_1
-[stream-_transform]: #stream_transform_transform_chunk_encoding_callback
-[stream-_write]: #stream_writable_write_chunk_encoding_callback_1
-[stream-_writev]: #stream_writable_writev_chunks_callback
-[stream-end]: #stream_writable_end_chunk_encoding_callback
-[stream-pause]: #stream_readable_pause
-[stream-push]: #stream_readable_push_chunk_encoding
-[stream-read]: #stream_readable_read_size
-[stream-resume]: #stream_readable_resume
-[stream-write]: #stream_writable_write_chunk_encoding_callback
-[TCP sockets]: https://nodejs.org/docs/v5.8.0/api/net.html#net_class_net_socket
-[Transform]: #stream_class_stream_transform
-[Writable]: #stream_class_stream_writable
-[zlib]: zlib.html
diff --git a/node_modules/through2/node_modules/readable-stream/doc/wg-meetings/2015-01-30.md b/node_modules/through2/node_modules/readable-stream/doc/wg-meetings/2015-01-30.md
deleted file mode 100644
index 83275f192..000000000
--- a/node_modules/through2/node_modules/readable-stream/doc/wg-meetings/2015-01-30.md
+++ /dev/null
@@ -1,60 +0,0 @@
-# streams WG Meeting 2015-01-30
-
-## Links
-
-* **Google Hangouts Video**: http://www.youtube.com/watch?v=I9nDOSGfwZg
-* **GitHub Issue**: https://github.com/iojs/readable-stream/issues/106
-* **Original Minutes Google Doc**: https://docs.google.com/document/d/17aTgLnjMXIrfjgNaTUnHQO7m3xgzHR2VXBTmi03Qii4/
-
-## Agenda
-
-Extracted from https://github.com/iojs/readable-stream/labels/wg-agenda prior to meeting.
-
-* adopt a charter [#105](https://github.com/iojs/readable-stream/issues/105)
-* release and versioning strategy [#101](https://github.com/iojs/readable-stream/issues/101)
-* simpler stream creation [#102](https://github.com/iojs/readable-stream/issues/102)
-* proposal: deprecate implicit flowing of streams [#99](https://github.com/iojs/readable-stream/issues/99)
-
-## Minutes
-
-### adopt a charter
-
-* group: +1's all around
-
-### What versioning scheme should be adopted?
-* group: +1’s 3.0.0
-* domenic+group: pulling in patches from other sources where appropriate
-* mikeal: version independently, suggesting versions for io.js
-* mikeal+domenic: work with TC to notify in advance of changes
-simpler stream creation
-
-### streamline creation of streams
-* sam: streamline creation of streams
-* domenic: nice simple solution posted
-  but, we lose the opportunity to change the model
-  may not be backwards incompatible (double check keys)
-
-  **action item:** domenic will check
-
-### remove implicit flowing of streams on(‘data’)
-* add isFlowing / isPaused
-* mikeal: worrying that we’re documenting polyfill methods – confuses users
-* domenic: more reflective API is probably good, with warning labels for users
-* new section for mad scientists (reflective stream access)
-* calvin: name the “third state”
-* mikeal: maybe borrow the name from whatwg?
-* domenic: we’re missing the “third state”
-* consensus: kind of difficult to name the third state
-* mikeal: figure out differences in states / compat
-* mathias: always flow on data – eliminates third state
-  * explore what it breaks
-
-**action items:**
-* ask isaac for ability to list packages by what public io.js APIs they use (esp. Stream)
-* ask rod/build for infrastructure
-* **chris**: explore the “flow on data” approach
-* add isPaused/isFlowing
-* add new docs section
-* move isPaused to that section
-
-
diff --git a/node_modules/through2/node_modules/readable-stream/duplex.js b/node_modules/through2/node_modules/readable-stream/duplex.js
deleted file mode 100644
index ca807af87..000000000
--- a/node_modules/through2/node_modules/readable-stream/duplex.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = require("./lib/_stream_duplex.js")
diff --git a/node_modules/through2/node_modules/readable-stream/lib/_stream_duplex.js b/node_modules/through2/node_modules/readable-stream/lib/_stream_duplex.js
deleted file mode 100644
index 736693b84..000000000
--- a/node_modules/through2/node_modules/readable-stream/lib/_stream_duplex.js
+++ /dev/null
@@ -1,75 +0,0 @@
-// a duplex stream is just a stream that is both readable and writable.
-// Since JS doesn't have multiple prototypal inheritance, this class
-// prototypally inherits from Readable, and then parasitically from
-// Writable.
-
-'use strict';
-
-/*<replacement>*/
-
-var objectKeys = Object.keys || function (obj) {
-  var keys = [];
-  for (var key in obj) {
-    keys.push(key);
-  }return keys;
-};
-/*</replacement>*/
-
-module.exports = Duplex;
-
-/*<replacement>*/
-var processNextTick = require('process-nextick-args');
-/*</replacement>*/
-
-/*<replacement>*/
-var util = require('core-util-is');
-util.inherits = require('inherits');
-/*</replacement>*/
-
-var Readable = require('./_stream_readable');
-var Writable = require('./_stream_writable');
-
-util.inherits(Duplex, Readable);
-
-var keys = objectKeys(Writable.prototype);
-for (var v = 0; v < keys.length; v++) {
-  var method = keys[v];
-  if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];
-}
-
-function Duplex(options) {
-  if (!(this instanceof Duplex)) return new Duplex(options);
-
-  Readable.call(this, options);
-  Writable.call(this, options);
-
-  if (options && options.readable === false) this.readable = false;
-
-  if (options && options.writable === false) this.writable = false;
-
-  this.allowHalfOpen = true;
-  if (options && options.allowHalfOpen === false) this.allowHalfOpen = false;
-
-  this.once('end', onend);
-}
-
-// the no-half-open enforcer
-function onend() {
-  // if we allow half-open state, or if the writable side ended,
-  // then we're ok.
-  if (this.allowHalfOpen || this._writableState.ended) return;
-
-  // no more data can be written.
-  // But allow more writes to happen in this tick.
-  processNextTick(onEndNT, this);
-}
-
-function onEndNT(self) {
-  self.end();
-}
-
-function forEach(xs, f) {
-  for (var i = 0, l = xs.length; i < l; i++) {
-    f(xs[i], i);
-  }
-}
\ No newline at end of file
diff --git a/node_modules/through2/node_modules/readable-stream/lib/_stream_passthrough.js b/node_modules/through2/node_modules/readable-stream/lib/_stream_passthrough.js
deleted file mode 100644
index d06f71f18..000000000
--- a/node_modules/through2/node_modules/readable-stream/lib/_stream_passthrough.js
+++ /dev/null
@@ -1,26 +0,0 @@
-// a passthrough stream.
-// basically just the most minimal sort of Transform stream.
-// Every written chunk gets output as-is.
-
-'use strict';
-
-module.exports = PassThrough;
-
-var Transform = require('./_stream_transform');
-
-/*<replacement>*/
-var util = require('core-util-is');
-util.inherits = require('inherits');
-/*</replacement>*/
-
-util.inherits(PassThrough, Transform);
-
-function PassThrough(options) {
-  if (!(this instanceof PassThrough)) return new PassThrough(options);
-
-  Transform.call(this, options);
-}
-
-PassThrough.prototype._transform = function (chunk, encoding, cb) {
-  cb(null, chunk);
-};
\ No newline at end of file
diff --git a/node_modules/through2/node_modules/readable-stream/lib/_stream_readable.js b/node_modules/through2/node_modules/readable-stream/lib/_stream_readable.js
deleted file mode 100644
index 54a9d5c55..000000000
--- a/node_modules/through2/node_modules/readable-stream/lib/_stream_readable.js
+++ /dev/null
@@ -1,880 +0,0 @@
-'use strict';
-
-module.exports = Readable;
-
-/*<replacement>*/
-var processNextTick = require('process-nextick-args');
-/*</replacement>*/
-
-/*<replacement>*/
-var isArray = require('isarray');
-/*</replacement>*/
-
-/*<replacement>*/
-var Buffer = require('buffer').Buffer;
-/*</replacement>*/
-
-Readable.ReadableState = ReadableState;
-
-var EE = require('events');
-
-/*<replacement>*/
-var EElistenerCount = function (emitter, type) {
-  return emitter.listeners(type).length;
-};
-/*</replacement>*/
-
-/*<replacement>*/
-var Stream;
-(function () {
-  try {
-    Stream = require('st' + 'ream');
-  } catch (_) {} finally {
-    if (!Stream) Stream = require('events').EventEmitter;
-  }
-})();
-/*</replacement>*/
-
-var Buffer = require('buffer').Buffer;
-
-/*<replacement>*/
-var util = require('core-util-is');
-util.inherits = require('inherits');
-/*</replacement>*/
-
-/*<replacement>*/
-var debugUtil = require('util');
-var debug = undefined;
-if (debugUtil && debugUtil.debuglog) {
-  debug = debugUtil.debuglog('stream');
-} else {
-  debug = function () {};
-}
-/*</replacement>*/
-
-var StringDecoder;
-
-util.inherits(Readable, Stream);
-
-var Duplex;
-function ReadableState(options, stream) {
-  Duplex = Duplex || require('./_stream_duplex');
-
-  options = options || {};
-
-  // object stream flag. Used to make read(n) ignore n and to
-  // make all the buffer merging and length checks go away
-  this.objectMode = !!options.objectMode;
-
-  if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.readableObjectMode;
-
-  // the point at which it stops calling _read() to fill the buffer
-  // Note: 0 is a valid value, means "don't call _read preemptively ever"
-  var hwm = options.highWaterMark;
-  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
-  this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;
-
-  // cast to ints.
-  this.highWaterMark = ~ ~this.highWaterMark;
-
-  this.buffer = [];
-  this.length = 0;
-  this.pipes = null;
-  this.pipesCount = 0;
-  this.flowing = null;
-  this.ended = false;
-  this.endEmitted = false;
-  this.reading = false;
-
-  // a flag to be able to tell if the onwrite cb is called immediately,
-  // or on a later tick.  We set this to true at first, because any
-  // actions that shouldn't happen until "later" should generally also
-  // not happen before the first write call.
-  this.sync = true;
-
-  // whenever we return null, then we set a flag to say
-  // that we're awaiting a 'readable' event emission.
-  this.needReadable = false;
-  this.emittedReadable = false;
-  this.readableListening = false;
-  this.resumeScheduled = false;
-
-  // Crypto is kind of old and crusty.  Historically, its default string
-  // encoding is 'binary' so we have to make this configurable.
-  // Everything else in the universe uses 'utf8', though.
-  this.defaultEncoding = options.defaultEncoding || 'utf8';
-
-  // when piping, we only care about 'readable' events that happen
-  // after read()ing all the bytes and not getting any pushback.
-  this.ranOut = false;
-
-  // the number of writers that are awaiting a drain event in .pipe()s
-  this.awaitDrain = 0;
-
-  // if true, a maybeReadMore has been scheduled
-  this.readingMore = false;
-
-  this.decoder = null;
-  this.encoding = null;
-  if (options.encoding) {
-    if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
-    this.decoder = new StringDecoder(options.encoding);
-    this.encoding = options.encoding;
-  }
-}
-
-var Duplex;
-function Readable(options) {
-  Duplex = Duplex || require('./_stream_duplex');
-
-  if (!(this instanceof Readable)) return new Readable(options);
-
-  this._readableState = new ReadableState(options, this);
-
-  // legacy
-  this.readable = true;
-
-  if (options && typeof options.read === 'function') this._read = options.read;
-
-  Stream.call(this);
-}
-
-// Manually shove something into the read() buffer.
-// This returns true if the highWaterMark has not been hit yet,
-// similar to how Writable.write() returns true if you should
-// write() some more.
-Readable.prototype.push = function (chunk, encoding) {
-  var state = this._readableState;
-
-  if (!state.objectMode && typeof chunk === 'string') {
-    encoding = encoding || state.defaultEncoding;
-    if (encoding !== state.encoding) {
-      chunk = new Buffer(chunk, encoding);
-      encoding = '';
-    }
-  }
-
-  return readableAddChunk(this, state, chunk, encoding, false);
-};
-
-// Unshift should *always* be something directly out of read()
-Readable.prototype.unshift = function (chunk) {
-  var state = this._readableState;
-  return readableAddChunk(this, state, chunk, '', true);
-};
-
-Readable.prototype.isPaused = function () {
-  return this._readableState.flowing === false;
-};
-
-function readableAddChunk(stream, state, chunk, encoding, addToFront) {
-  var er = chunkInvalid(state, chunk);
-  if (er) {
-    stream.emit('error', er);
-  } else if (chunk === null) {
-    state.reading = false;
-    onEofChunk(stream, state);
-  } else if (state.objectMode || chunk && chunk.length > 0) {
-    if (state.ended && !addToFront) {
-      var e = new Error('stream.push() after EOF');
-      stream.emit('error', e);
-    } else if (state.endEmitted && addToFront) {
-      var e = new Error('stream.unshift() after end event');
-      stream.emit('error', e);
-    } else {
-      var skipAdd;
-      if (state.decoder && !addToFront && !encoding) {
-        chunk = state.decoder.write(chunk);
-        skipAdd = !state.objectMode && chunk.length === 0;
-      }
-
-      if (!addToFront) state.reading = false;
-
-      // Don't add to the buffer if we've decoded to an empty string chunk and
-      // we're not in object mode
-      if (!skipAdd) {
-        // if we want the data now, just emit it.
-        if (state.flowing && state.length === 0 && !state.sync) {
-          stream.emit('data', chunk);
-          stream.read(0);
-        } else {
-          // update the buffer info.
-          state.length += state.objectMode ? 1 : chunk.length;
-          if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);
-
-          if (state.needReadable) emitReadable(stream);
-        }
-      }
-
-      maybeReadMore(stream, state);
-    }
-  } else if (!addToFront) {
-    state.reading = false;
-  }
-
-  return needMoreData(state);
-}
-
-// if it's past the high water mark, we can push in some more.
-// Also, if we have no data yet, we can stand some
-// more bytes.  This is to work around cases where hwm=0,
-// such as the repl.  Also, if the push() triggered a
-// readable event, and the user called read(largeNumber) such that
-// needReadable was set, then we ought to push more, so that another
-// 'readable' event will be triggered.
-function needMoreData(state) {
-  return !state.ended && (state.needReadable || state.length < state.highWaterMark || state.length === 0);
-}
-
-// backwards compatibility.
-Readable.prototype.setEncoding = function (enc) {
-  if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
-  this._readableState.decoder = new StringDecoder(enc);
-  this._readableState.encoding = enc;
-  return this;
-};
-
-// Don't raise the hwm > 8MB
-var MAX_HWM = 0x800000;
-function computeNewHighWaterMark(n) {
-  if (n >= MAX_HWM) {
-    n = MAX_HWM;
-  } else {
-    // Get the next highest power of 2
-    n--;
-    n |= n >>> 1;
-    n |= n >>> 2;
-    n |= n >>> 4;
-    n |= n >>> 8;
-    n |= n >>> 16;
-    n++;
-  }
-  return n;
-}
-
-function howMuchToRead(n, state) {
-  if (state.length === 0 && state.ended) return 0;
-
-  if (state.objectMode) return n === 0 ? 0 : 1;
-
-  if (n === null || isNaN(n)) {
-    // only flow one buffer at a time
-    if (state.flowing && state.buffer.length) return state.buffer[0].length;else return state.length;
-  }
-
-  if (n <= 0) return 0;
-
-  // If we're asking for more than the target buffer level,
-  // then raise the water mark.  Bump up to the next highest
-  // power of 2, to prevent increasing it excessively in tiny
-  // amounts.
-  if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n);
-
-  // don't have that much.  return null, unless we've ended.
-  if (n > state.length) {
-    if (!state.ended) {
-      state.needReadable = true;
-      return 0;
-    } else {
-      return state.length;
-    }
-  }
-
-  return n;
-}
-
-// you can override either this method, or the async _read(n) below.
-Readable.prototype.read = function (n) {
-  debug('read', n);
-  var state = this._readableState;
-  var nOrig = n;
-
-  if (typeof n !== 'number' || n > 0) state.emittedReadable = false;
-
-  // if we're doing read(0) to trigger a readable event, but we
-  // already have a bunch of data in the buffer, then just trigger
-  // the 'readable' event and move on.
-  if (n === 0 && state.needReadable && (state.length >= state.highWaterMark || state.ended)) {
-    debug('read: emitReadable', state.length, state.ended);
-    if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this);
-    return null;
-  }
-
-  n = howMuchToRead(n, state);
-
-  // if we've ended, and we're now clear, then finish it up.
-  if (n === 0 && state.ended) {
-    if (state.length === 0) endReadable(this);
-    return null;
-  }
-
-  // All the actual chunk generation logic needs to be
-  // *below* the call to _read.  The reason is that in certain
-  // synthetic stream cases, such as passthrough streams, _read
-  // may be a completely synchronous operation which may change
-  // the state of the read buffer, providing enough data when
-  // before there was *not* enough.
-  //
-  // So, the steps are:
-  // 1. Figure out what the state of things will be after we do
-  // a read from the buffer.
-  //
-  // 2. If that resulting state will trigger a _read, then call _read.
-  // Note that this may be asynchronous, or synchronous.  Yes, it is
-  // deeply ugly to write APIs this way, but that still doesn't mean
-  // that the Readable class should behave improperly, as streams are
-  // designed to be sync/async agnostic.
-  // Take note if the _read call is sync or async (ie, if the read call
-  // has returned yet), so that we know whether or not it's safe to emit
-  // 'readable' etc.
-  //
-  // 3. Actually pull the requested chunks out of the buffer and return.
-
-  // if we need a readable event, then we need to do some reading.
-  var doRead = state.needReadable;
-  debug('need readable', doRead);
-
-  // if we currently have less than the highWaterMark, then also read some
-  if (state.length === 0 || state.length - n < state.highWaterMark) {
-    doRead = true;
-    debug('length less than watermark', doRead);
-  }
-
-  // however, if we've ended, then there's no point, and if we're already
-  // reading, then it's unnecessary.
-  if (state.ended || state.reading) {
-    doRead = false;
-    debug('reading or ended', doRead);
-  }
-
-  if (doRead) {
-    debug('do read');
-    state.reading = true;
-    state.sync = true;
-    // if the length is currently zero, then we *need* a readable event.
-    if (state.length === 0) state.needReadable = true;
-    // call internal read method
-    this._read(state.highWaterMark);
-    state.sync = false;
-  }
-
-  // If _read pushed data synchronously, then `reading` will be false,
-  // and we need to re-evaluate how much data we can return to the user.
-  if (doRead && !state.reading) n = howMuchToRead(nOrig, state);
-
-  var ret;
-  if (n > 0) ret = fromList(n, state);else ret = null;
-
-  if (ret === null) {
-    state.needReadable = true;
-    n = 0;
-  }
-
-  state.length -= n;
-
-  // If we have nothing in the buffer, then we want to know
-  // as soon as we *do* get something into the buffer.
-  if (state.length === 0 && !state.ended) state.needReadable = true;
-
-  // If we tried to read() past the EOF, then emit end on the next tick.
-  if (nOrig !== n && state.ended && state.length === 0) endReadable(this);
-
-  if (ret !== null) this.emit('data', ret);
-
-  return ret;
-};
-
-function chunkInvalid(state, chunk) {
-  var er = null;
-  if (!Buffer.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== null && chunk !== undefined && !state.objectMode) {
-    er = new TypeError('Invalid non-string/buffer chunk');
-  }
-  return er;
-}
-
-function onEofChunk(stream, state) {
-  if (state.ended) return;
-  if (state.decoder) {
-    var chunk = state.decoder.end();
-    if (chunk && chunk.length) {
-      state.buffer.push(chunk);
-      state.length += state.objectMode ? 1 : chunk.length;
-    }
-  }
-  state.ended = true;
-
-  // emit 'readable' now to make sure it gets picked up.
-  emitReadable(stream);
-}
-
-// Don't emit readable right away in sync mode, because this can trigger
-// another read() call => stack overflow.  This way, it might trigger
-// a nextTick recursion warning, but that's not so bad.
-function emitReadable(stream) {
-  var state = stream._readableState;
-  state.needReadable = false;
-  if (!state.emittedReadable) {
-    debug('emitReadable', state.flowing);
-    state.emittedReadable = true;
-    if (state.sync) processNextTick(emitReadable_, stream);else emitReadable_(stream);
-  }
-}
-
-function emitReadable_(stream) {
-  debug('emit readable');
-  stream.emit('readable');
-  flow(stream);
-}
-
-// at this point, the user has presumably seen the 'readable' event,
-// and called read() to consume some data.  that may have triggered
-// in turn another _read(n) call, in which case reading = true if
-// it's in progress.
-// However, if we're not ended, or reading, and the length < hwm,
-// then go ahead and try to read some more preemptively.
-function maybeReadMore(stream, state) {
-  if (!state.readingMore) {
-    state.readingMore = true;
-    processNextTick(maybeReadMore_, stream, state);
-  }
-}
-
-function maybeReadMore_(stream, state) {
-  var len = state.length;
-  while (!state.reading && !state.flowing && !state.ended && state.length < state.highWaterMark) {
-    debug('maybeReadMore read 0');
-    stream.read(0);
-    if (len === state.length)
-      // didn't get any data, stop spinning.
-      break;else len = state.length;
-  }
-  state.readingMore = false;
-}
-
-// abstract method.  to be overridden in specific implementation classes.
-// call cb(er, data) where data is <= n in length.
-// for virtual (non-string, non-buffer) streams, "length" is somewhat
-// arbitrary, and perhaps not very meaningful.
-Readable.prototype._read = function (n) {
-  this.emit('error', new Error('not implemented'));
-};
-
-Readable.prototype.pipe = function (dest, pipeOpts) {
-  var src = this;
-  var state = this._readableState;
-
-  switch (state.pipesCount) {
-    case 0:
-      state.pipes = dest;
-      break;
-    case 1:
-      state.pipes = [state.pipes, dest];
-      break;
-    default:
-      state.pipes.push(dest);
-      break;
-  }
-  state.pipesCount += 1;
-  debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);
-
-  var doEnd = (!pipeOpts || pipeOpts.end !== false) && dest !== process.stdout && dest !== process.stderr;
-
-  var endFn = doEnd ? onend : cleanup;
-  if (state.endEmitted) processNextTick(endFn);else src.once('end', endFn);
-
-  dest.on('unpipe', onunpipe);
-  function onunpipe(readable) {
-    debug('onunpipe');
-    if (readable === src) {
-      cleanup();
-    }
-  }
-
-  function onend() {
-    debug('onend');
-    dest.end();
-  }
-
-  // when the dest drains, it reduces the awaitDrain counter
-  // on the source.  This would be more elegant with a .once()
-  // handler in flow(), but adding and removing repeatedly is
-  // too slow.
-  var ondrain = pipeOnDrain(src);
-  dest.on('drain', ondrain);
-
-  var cleanedUp = false;
-  function cleanup() {
-    debug('cleanup');
-    // cleanup event handlers once the pipe is broken
-    dest.removeListener('close', onclose);
-    dest.removeListener('finish', onfinish);
-    dest.removeListener('drain', ondrain);
-    dest.removeListener('error', onerror);
-    dest.removeListener('unpipe', onunpipe);
-    src.removeListener('end', onend);
-    src.removeListener('end', cleanup);
-    src.removeListener('data', ondata);
-
-    cleanedUp = true;
-
-    // if the reader is waiting for a drain event from this
-    // specific writer, then it would cause it to never start
-    // flowing again.
-    // So, if this is awaiting a drain, then we just call it now.
-    // If we don't know, then assume that we are waiting for one.
-    if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain();
-  }
-
-  src.on('data', ondata);
-  function ondata(chunk) {
-    debug('ondata');
-    var ret = dest.write(chunk);
-    if (false === ret) {
-      // If the user unpiped during `dest.write()`, it is possible
-      // to get stuck in a permanently paused state if that write
-      // also returned false.
-      if (state.pipesCount === 1 && state.pipes[0] === dest && src.listenerCount('data') === 1 && !cleanedUp) {
-        debug('false write response, pause', src._readableState.awaitDrain);
-        src._readableState.awaitDrain++;
-      }
-      src.pause();
-    }
-  }
-
-  // if the dest has an error, then stop piping into it.
-  // however, don't suppress the throwing behavior for this.
-  function onerror(er) {
-    debug('onerror', er);
-    unpipe();
-    dest.removeListener('error', onerror);
-    if (EElistenerCount(dest, 'error') === 0) dest.emit('error', er);
-  }
-  // This is a brutally ugly hack to make sure that our error handler
-  // is attached before any userland ones.  NEVER DO THIS.
-  if (!dest._events || !dest._events.error) dest.on('error', onerror);else if (isArray(dest._events.error)) dest._events.error.unshift(onerror);else dest._events.error = [onerror, dest._events.error];
-
-  // Both close and finish should trigger unpipe, but only once.
-  function onclose() {
-    dest.removeListener('finish', onfinish);
-    unpipe();
-  }
-  dest.once('close', onclose);
-  function onfinish() {
-    debug('onfinish');
-    dest.removeListener('close', onclose);
-    unpipe();
-  }
-  dest.once('finish', onfinish);
-
-  function unpipe() {
-    debug('unpipe');
-    src.unpipe(dest);
-  }
-
-  // tell the dest that it's being piped to
-  dest.emit('pipe', src);
-
-  // start the flow if it hasn't been started already.
-  if (!state.flowing) {
-    debug('pipe resume');
-    src.resume();
-  }
-
-  return dest;
-};
-
-function pipeOnDrain(src) {
-  return function () {
-    var state = src._readableState;
-    debug('pipeOnDrain', state.awaitDrain);
-    if (state.awaitDrain) state.awaitDrain--;
-    if (state.awaitDrain === 0 && EElistenerCount(src, 'data')) {
-      state.flowing = true;
-      flow(src);
-    }
-  };
-}
-
-Readable.prototype.unpipe = function (dest) {
-  var state = this._readableState;
-
-  // if we're not piping anywhere, then do nothing.
-  if (state.pipesCount === 0) return this;
-
-  // just one destination.  most common case.
-  if (state.pipesCount === 1) {
-    // passed in one, but it's not the right one.
-    if (dest && dest !== state.pipes) return this;
-
-    if (!dest) dest = state.pipes;
-
-    // got a match.
-    state.pipes = null;
-    state.pipesCount = 0;
-    state.flowing = false;
-    if (dest) dest.emit('unpipe', this);
-    return this;
-  }
-
-  // slow case. multiple pipe destinations.
-
-  if (!dest) {
-    // remove all.
-    var dests = state.pipes;
-    var len = state.pipesCount;
-    state.pipes = null;
-    state.pipesCount = 0;
-    state.flowing = false;
-
-    for (var _i = 0; _i < len; _i++) {
-      dests[_i].emit('unpipe', this);
-    }return this;
-  }
-
-  // try to find the right one.
-  var i = indexOf(state.pipes, dest);
-  if (i === -1) return this;
-
-  state.pipes.splice(i, 1);
-  state.pipesCount -= 1;
-  if (state.pipesCount === 1) state.pipes = state.pipes[0];
-
-  dest.emit('unpipe', this);
-
-  return this;
-};
-
-// set up data events if they are asked for
-// Ensure readable listeners eventually get something
-Readable.prototype.on = function (ev, fn) {
-  var res = Stream.prototype.on.call(this, ev, fn);
-
-  // If listening to data, and it has not explicitly been paused,
-  // then call resume to start the flow of data on the next tick.
-  if (ev === 'data' && false !== this._readableState.flowing) {
-    this.resume();
-  }
-
-  if (ev === 'readable' && !this._readableState.endEmitted) {
-    var state = this._readableState;
-    if (!state.readableListening) {
-      state.readableListening = true;
-      state.emittedReadable = false;
-      state.needReadable = true;
-      if (!state.reading) {
-        processNextTick(nReadingNextTick, this);
-      } else if (state.length) {
-        emitReadable(this, state);
-      }
-    }
-  }
-
-  return res;
-};
-Readable.prototype.addListener = Readable.prototype.on;
-
-function nReadingNextTick(self) {
-  debug('readable nexttick read 0');
-  self.read(0);
-}
-
-// pause() and resume() are remnants of the legacy readable stream API
-// If the user uses them, then switch into old mode.
-Readable.prototype.resume = function () {
-  var state = this._readableState;
-  if (!state.flowing) {
-    debug('resume');
-    state.flowing = true;
-    resume(this, state);
-  }
-  return this;
-};
-
-function resume(stream, state) {
-  if (!state.resumeScheduled) {
-    state.resumeScheduled = true;
-    processNextTick(resume_, stream, state);
-  }
-}
-
-function resume_(stream, state) {
-  if (!state.reading) {
-    debug('resume read 0');
-    stream.read(0);
-  }
-
-  state.resumeScheduled = false;
-  stream.emit('resume');
-  flow(stream);
-  if (state.flowing && !state.reading) stream.read(0);
-}
-
-Readable.prototype.pause = function () {
-  debug('call pause flowing=%j', this._readableState.flowing);
-  if (false !== this._readableState.flowing) {
-    debug('pause');
-    this._readableState.flowing = false;
-    this.emit('pause');
-  }
-  return this;
-};
-
-function flow(stream) {
-  var state = stream._readableState;
-  debug('flow', state.flowing);
-  if (state.flowing) {
-    do {
-      var chunk = stream.read();
-    } while (null !== chunk && state.flowing);
-  }
-}
-
-// wrap an old-style stream as the async data source.
-// This is *not* part of the readable stream interface.
-// It is an ugly unfortunate mess of history.
-Readable.prototype.wrap = function (stream) {
-  var state = this._readableState;
-  var paused = false;
-
-  var self = this;
-  stream.on('end', function () {
-    debug('wrapped end');
-    if (state.decoder && !state.ended) {
-      var chunk = state.decoder.end();
-      if (chunk && chunk.length) self.push(chunk);
-    }
-
-    self.push(null);
-  });
-
-  stream.on('data', function (chunk) {
-    debug('wrapped data');
-    if (state.decoder) chunk = state.decoder.write(chunk);
-
-    // don't skip over falsy values in objectMode
-    if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return;
-
-    var ret = self.push(chunk);
-    if (!ret) {
-      paused = true;
-      stream.pause();
-    }
-  });
-
-  // proxy all the other methods.
-  // important when wrapping filters and duplexes.
-  for (var i in stream) {
-    if (this[i] === undefined && typeof stream[i] === 'function') {
-      this[i] = function (method) {
-        return function () {
-          return stream[method].apply(stream, arguments);
-        };
-      }(i);
-    }
-  }
-
-  // proxy certain important events.
-  var events = ['error', 'close', 'destroy', 'pause', 'resume'];
-  forEach(events, function (ev) {
-    stream.on(ev, self.emit.bind(self, ev));
-  });
-
-  // when we try to consume some more bytes, simply unpause the
-  // underlying stream.
-  self._read = function (n) {
-    debug('wrapped _read', n);
-    if (paused) {
-      paused = false;
-      stream.resume();
-    }
-  };
-
-  return self;
-};
-
-// exposed for testing purposes only.
-Readable._fromList = fromList;
-
-// Pluck off n bytes from an array of buffers.
-// Length is the combined lengths of all the buffers in the list.
-function fromList(n, state) {
-  var list = state.buffer;
-  var length = state.length;
-  var stringMode = !!state.decoder;
-  var objectMode = !!state.objectMode;
-  var ret;
-
-  // nothing in the list, definitely empty.
-  if (list.length === 0) return null;
-
-  if (length === 0) ret = null;else if (objectMode) ret = list.shift();else if (!n || n >= length) {
-    // read it all, truncate the array.
-    if (stringMode) ret = list.join('');else if (list.length === 1) ret = list[0];else ret = Buffer.concat(list, length);
-    list.length = 0;
-  } else {
-    // read just some of it.
-    if (n < list[0].length) {
-      // just take a part of the first list item.
-      // slice is the same for buffers and strings.
-      var buf = list[0];
-      ret = buf.slice(0, n);
-      list[0] = buf.slice(n);
-    } else if (n === list[0].length) {
-      // first list is a perfect match
-      ret = list.shift();
-    } else {
-      // complex case.
-      // we have enough to cover it, but it spans past the first buffer.
-      if (stringMode) ret = '';else ret = new Buffer(n);
-
-      var c = 0;
-      for (var i = 0, l = list.length; i < l && c < n; i++) {
-        var buf = list[0];
-        var cpy = Math.min(n - c, buf.length);
-
-        if (stringMode) ret += buf.slice(0, cpy);else buf.copy(ret, c, 0, cpy);
-
-        if (cpy < buf.length) list[0] = buf.slice(cpy);else list.shift();
-
-        c += cpy;
-      }
-    }
-  }
-
-  return ret;
-}
-
-function endReadable(stream) {
-  var state = stream._readableState;
-
-  // If we get here before consuming all the bytes, then that is a
-  // bug in node.  Should never happen.
-  if (state.length > 0) throw new Error('endReadable called on non-empty stream');
-
-  if (!state.endEmitted) {
-    state.ended = true;
-    processNextTick(endReadableNT, state, stream);
-  }
-}
-
-function endReadableNT(state, stream) {
-  // Check that we didn't get one last unshift.
-  if (!state.endEmitted && state.length === 0) {
-    state.endEmitted = true;
-    stream.readable = false;
-    stream.emit('end');
-  }
-}
-
-function forEach(xs, f) {
-  for (var i = 0, l = xs.length; i < l; i++) {
-    f(xs[i], i);
-  }
-}
-
-function indexOf(xs, x) {
-  for (var i = 0, l = xs.length; i < l; i++) {
-    if (xs[i] === x) return i;
-  }
-  return -1;
-}
\ No newline at end of file
diff --git a/node_modules/through2/node_modules/readable-stream/lib/_stream_transform.js b/node_modules/through2/node_modules/readable-stream/lib/_stream_transform.js
deleted file mode 100644
index 625cdc176..000000000
--- a/node_modules/through2/node_modules/readable-stream/lib/_stream_transform.js
+++ /dev/null
@@ -1,180 +0,0 @@
-// a transform stream is a readable/writable stream where you do
-// something with the data.  Sometimes it's called a "filter",
-// but that's not a great name for it, since that implies a thing where
-// some bits pass through, and others are simply ignored.  (That would
-// be a valid example of a transform, of course.)
-//
-// While the output is causally related to the input, it's not a
-// necessarily symmetric or synchronous transformation.  For example,
-// a zlib stream might take multiple plain-text writes(), and then
-// emit a single compressed chunk some time in the future.
-//
-// Here's how this works:
-//
-// The Transform stream has all the aspects of the readable and writable
-// stream classes.  When you write(chunk), that calls _write(chunk,cb)
-// internally, and returns false if there's a lot of pending writes
-// buffered up.  When you call read(), that calls _read(n) until
-// there's enough pending readable data buffered up.
-//
-// In a transform stream, the written data is placed in a buffer.  When
-// _read(n) is called, it transforms the queued up data, calling the
-// buffered _write cb's as it consumes chunks.  If consuming a single
-// written chunk would result in multiple output chunks, then the first
-// outputted bit calls the readcb, and subsequent chunks just go into
-// the read buffer, and will cause it to emit 'readable' if necessary.
-//
-// This way, back-pressure is actually determined by the reading side,
-// since _read has to be called to start processing a new chunk.  However,
-// a pathological inflate type of transform can cause excessive buffering
-// here.  For example, imagine a stream where every byte of input is
-// interpreted as an integer from 0-255, and then results in that many
-// bytes of output.  Writing the 4 bytes {ff,ff,ff,ff} would result in
-// 1kb of data being output.  In this case, you could write a very small
-// amount of input, and end up with a very large amount of output.  In
-// such a pathological inflating mechanism, there'd be no way to tell
-// the system to stop doing the transform.  A single 4MB write could
-// cause the system to run out of memory.
-//
-// However, even in such a pathological case, only a single written chunk
-// would be consumed, and then the rest would wait (un-transformed) until
-// the results of the previous transformed chunk were consumed.
-
-'use strict';
-
-module.exports = Transform;
-
-var Duplex = require('./_stream_duplex');
-
-/*<replacement>*/
-var util = require('core-util-is');
-util.inherits = require('inherits');
-/*</replacement>*/
-
-util.inherits(Transform, Duplex);
-
-function TransformState(stream) {
-  this.afterTransform = function (er, data) {
-    return afterTransform(stream, er, data);
-  };
-
-  this.needTransform = false;
-  this.transforming = false;
-  this.writecb = null;
-  this.writechunk = null;
-  this.writeencoding = null;
-}
-
-function afterTransform(stream, er, data) {
-  var ts = stream._transformState;
-  ts.transforming = false;
-
-  var cb = ts.writecb;
-
-  if (!cb) return stream.emit('error', new Error('no writecb in Transform class'));
-
-  ts.writechunk = null;
-  ts.writecb = null;
-
-  if (data !== null && data !== undefined) stream.push(data);
-
-  cb(er);
-
-  var rs = stream._readableState;
-  rs.reading = false;
-  if (rs.needReadable || rs.length < rs.highWaterMark) {
-    stream._read(rs.highWaterMark);
-  }
-}
-
-function Transform(options) {
-  if (!(this instanceof Transform)) return new Transform(options);
-
-  Duplex.call(this, options);
-
-  this._transformState = new TransformState(this);
-
-  // when the writable side finishes, then flush out anything remaining.
-  var stream = this;
-
-  // start out asking for a readable event once data is transformed.
-  this._readableState.needReadable = true;
-
-  // we have implemented the _read method, and done the other things
-  // that Readable wants before the first _read call, so unset the
-  // sync guard flag.
-  this._readableState.sync = false;
-
-  if (options) {
-    if (typeof options.transform === 'function') this._transform = options.transform;
-
-    if (typeof options.flush === 'function') this._flush = options.flush;
-  }
-
-  this.once('prefinish', function () {
-    if (typeof this._flush === 'function') this._flush(function (er) {
-      done(stream, er);
-    });else done(stream);
-  });
-}
-
-Transform.prototype.push = function (chunk, encoding) {
-  this._transformState.needTransform = false;
-  return Duplex.prototype.push.call(this, chunk, encoding);
-};
-
-// This is the part where you do stuff!
-// override this function in implementation classes.
-// 'chunk' is an input chunk.
-//
-// Call `push(newChunk)` to pass along transformed output
-// to the readable side.  You may call 'push' zero or more times.
-//
-// Call `cb(err)` when you are done with this chunk.  If you pass
-// an error, then that'll put the hurt on the whole operation.  If you
-// never call cb(), then you'll never get another chunk.
-Transform.prototype._transform = function (chunk, encoding, cb) {
-  throw new Error('not implemented');
-};
-
-Transform.prototype._write = function (chunk, encoding, cb) {
-  var ts = this._transformState;
-  ts.writecb = cb;
-  ts.writechunk = chunk;
-  ts.writeencoding = encoding;
-  if (!ts.transforming) {
-    var rs = this._readableState;
-    if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark);
-  }
-};
-
-// Doesn't matter what the args are here.
-// _transform does all the work.
-// That we got here means that the readable side wants more data.
-Transform.prototype._read = function (n) {
-  var ts = this._transformState;
-
-  if (ts.writechunk !== null && ts.writecb && !ts.transforming) {
-    ts.transforming = true;
-    this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);
-  } else {
-    // mark that we need a transform, so that any data that comes in
-    // will get processed, now that we've asked for it.
-    ts.needTransform = true;
-  }
-};
-
-function done(stream, er) {
-  if (er) return stream.emit('error', er);
-
-  // if there's nothing in the write buffer, then that means
-  // that nothing more will ever be provided
-  var ws = stream._writableState;
-  var ts = stream._transformState;
-
-  if (ws.length) throw new Error('calling transform done when ws.length != 0');
-
-  if (ts.transforming) throw new Error('calling transform done when still transforming');
-
-  return stream.push(null);
-}
\ No newline at end of file
diff --git a/node_modules/through2/node_modules/readable-stream/lib/_stream_writable.js b/node_modules/through2/node_modules/readable-stream/lib/_stream_writable.js
deleted file mode 100644
index 95916c992..000000000
--- a/node_modules/through2/node_modules/readable-stream/lib/_stream_writable.js
+++ /dev/null
@@ -1,516 +0,0 @@
-// A bit simpler than readable streams.
-// Implement an async ._write(chunk, encoding, cb), and it'll handle all
-// the drain event emission and buffering.
-
-'use strict';
-
-module.exports = Writable;
-
-/*<replacement>*/
-var processNextTick = require('process-nextick-args');
-/*</replacement>*/
-
-/*<replacement>*/
-var asyncWrite = !process.browser && ['v0.10', 'v0.9.'].indexOf(process.version.slice(0, 5)) > -1 ? setImmediate : processNextTick;
-/*</replacement>*/
-
-/*<replacement>*/
-var Buffer = require('buffer').Buffer;
-/*</replacement>*/
-
-Writable.WritableState = WritableState;
-
-/*<replacement>*/
-var util = require('core-util-is');
-util.inherits = require('inherits');
-/*</replacement>*/
-
-/*<replacement>*/
-var internalUtil = {
-  deprecate: require('util-deprecate')
-};
-/*</replacement>*/
-
-/*<replacement>*/
-var Stream;
-(function () {
-  try {
-    Stream = require('st' + 'ream');
-  } catch (_) {} finally {
-    if (!Stream) Stream = require('events').EventEmitter;
-  }
-})();
-/*</replacement>*/
-
-var Buffer = require('buffer').Buffer;
-
-util.inherits(Writable, Stream);
-
-function nop() {}
-
-function WriteReq(chunk, encoding, cb) {
-  this.chunk = chunk;
-  this.encoding = encoding;
-  this.callback = cb;
-  this.next = null;
-}
-
-var Duplex;
-function WritableState(options, stream) {
-  Duplex = Duplex || require('./_stream_duplex');
-
-  options = options || {};
-
-  // object stream flag to indicate whether or not this stream
-  // contains buffers or objects.
-  this.objectMode = !!options.objectMode;
-
-  if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.writableObjectMode;
-
-  // the point at which write() starts returning false
-  // Note: 0 is a valid value, means that we always return false if
-  // the entire buffer is not flushed immediately on write()
-  var hwm = options.highWaterMark;
-  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
-  this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;
-
-  // cast to ints.
-  this.highWaterMark = ~ ~this.highWaterMark;
-
-  this.needDrain = false;
-  // at the start of calling end()
-  this.ending = false;
-  // when end() has been called, and returned
-  this.ended = false;
-  // when 'finish' is emitted
-  this.finished = false;
-
-  // should we decode strings into buffers before passing to _write?
-  // this is here so that some node-core streams can optimize string
-  // handling at a lower level.
-  var noDecode = options.decodeStrings === false;
-  this.decodeStrings = !noDecode;
-
-  // Crypto is kind of old and crusty.  Historically, its default string
-  // encoding is 'binary' so we have to make this configurable.
-  // Everything else in the universe uses 'utf8', though.
-  this.defaultEncoding = options.defaultEncoding || 'utf8';
-
-  // not an actual buffer we keep track of, but a measurement
-  // of how much we're waiting to get pushed to some underlying
-  // socket or file.
-  this.length = 0;
-
-  // a flag to see when we're in the middle of a write.
-  this.writing = false;
-
-  // when true all writes will be buffered until .uncork() call
-  this.corked = 0;
-
-  // a flag to be able to tell if the onwrite cb is called immediately,
-  // or on a later tick.  We set this to true at first, because any
-  // actions that shouldn't happen until "later" should generally also
-  // not happen before the first write call.
-  this.sync = true;
-
-  // a flag to know if we're processing previously buffered items, which
-  // may call the _write() callback in the same tick, so that we don't
-  // end up in an overlapped onwrite situation.
-  this.bufferProcessing = false;
-
-  // the callback that's passed to _write(chunk,cb)
-  this.onwrite = function (er) {
-    onwrite(stream, er);
-  };
-
-  // the callback that the user supplies to write(chunk,encoding,cb)
-  this.writecb = null;
-
-  // the amount that is being written when _write is called.
-  this.writelen = 0;
-
-  this.bufferedRequest = null;
-  this.lastBufferedRequest = null;
-
-  // number of pending user-supplied write callbacks
-  // this must be 0 before 'finish' can be emitted
-  this.pendingcb = 0;
-
-  // emit prefinish if the only thing we're waiting for is _write cbs
-  // This is relevant for synchronous Transform streams
-  this.prefinished = false;
-
-  // True if the error was already emitted and should not be thrown again
-  this.errorEmitted = false;
-
-  // count buffered requests
-  this.bufferedRequestCount = 0;
-
-  // create the two objects needed to store the corked requests
-  // they are not a linked list, as no new elements are inserted in there
-  this.corkedRequestsFree = new CorkedRequest(this);
-  this.corkedRequestsFree.next = new CorkedRequest(this);
-}
-
-WritableState.prototype.getBuffer = function writableStateGetBuffer() {
-  var current = this.bufferedRequest;
-  var out = [];
-  while (current) {
-    out.push(current);
-    current = current.next;
-  }
-  return out;
-};
-
-(function () {
-  try {
-    Object.defineProperty(WritableState.prototype, 'buffer', {
-      get: internalUtil.deprecate(function () {
-        return this.getBuffer();
-      }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.')
-    });
-  } catch (_) {}
-})();
-
-var Duplex;
-function Writable(options) {
-  Duplex = Duplex || require('./_stream_duplex');
-
-  // Writable ctor is applied to Duplexes, though they're not
-  // instanceof Writable, they're instanceof Readable.
-  if (!(this instanceof Writable) && !(this instanceof Duplex)) return new Writable(options);
-
-  this._writableState = new WritableState(options, this);
-
-  // legacy.
-  this.writable = true;
-
-  if (options) {
-    if (typeof options.write === 'function') this._write = options.write;
-
-    if (typeof options.writev === 'function') this._writev = options.writev;
-  }
-
-  Stream.call(this);
-}
-
-// Otherwise people can pipe Writable streams, which is just wrong.
-Writable.prototype.pipe = function () {
-  this.emit('error', new Error('Cannot pipe. Not readable.'));
-};
-
-function writeAfterEnd(stream, cb) {
-  var er = new Error('write after end');
-  // TODO: defer error events consistently everywhere, not just the cb
-  stream.emit('error', er);
-  processNextTick(cb, er);
-}
-
-// If we get something that is not a buffer, string, null, or undefined,
-// and we're not in objectMode, then that's an error.
-// Otherwise stream chunks are all considered to be of length=1, and the
-// watermarks determine how many objects to keep in the buffer, rather than
-// how many bytes or characters.
-function validChunk(stream, state, chunk, cb) {
-  var valid = true;
-
-  if (!Buffer.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== null && chunk !== undefined && !state.objectMode) {
-    var er = new TypeError('Invalid non-string/buffer chunk');
-    stream.emit('error', er);
-    processNextTick(cb, er);
-    valid = false;
-  }
-  return valid;
-}
-
-Writable.prototype.write = function (chunk, encoding, cb) {
-  var state = this._writableState;
-  var ret = false;
-
-  if (typeof encoding === 'function') {
-    cb = encoding;
-    encoding = null;
-  }
-
-  if (Buffer.isBuffer(chunk)) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding;
-
-  if (typeof cb !== 'function') cb = nop;
-
-  if (state.ended) writeAfterEnd(this, cb);else if (validChunk(this, state, chunk, cb)) {
-    state.pendingcb++;
-    ret = writeOrBuffer(this, state, chunk, encoding, cb);
-  }
-
-  return ret;
-};
-
-Writable.prototype.cork = function () {
-  var state = this._writableState;
-
-  state.corked++;
-};
-
-Writable.prototype.uncork = function () {
-  var state = this._writableState;
-
-  if (state.corked) {
-    state.corked--;
-
-    if (!state.writing && !state.corked && !state.finished && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state);
-  }
-};
-
-Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {
-  // node::ParseEncoding() requires lower case.
-  if (typeof encoding === 'string') encoding = encoding.toLowerCase();
-  if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new TypeError('Unknown encoding: ' + encoding);
-  this._writableState.defaultEncoding = encoding;
-};
-
-function decodeChunk(state, chunk, encoding) {
-  if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {
-    chunk = new Buffer(chunk, encoding);
-  }
-  return chunk;
-}
-
-// if we're already writing something, then just put this
-// in the queue, and wait our turn.  Otherwise, call _write
-// If we return false, then we need a drain event, so set that flag.
-function writeOrBuffer(stream, state, chunk, encoding, cb) {
-  chunk = decodeChunk(state, chunk, encoding);
-
-  if (Buffer.isBuffer(chunk)) encoding = 'buffer';
-  var len = state.objectMode ? 1 : chunk.length;
-
-  state.length += len;
-
-  var ret = state.length < state.highWaterMark;
-  // we must ensure that previous needDrain will not be reset to false.
-  if (!ret) state.needDrain = true;
-
-  if (state.writing || state.corked) {
-    var last = state.lastBufferedRequest;
-    state.lastBufferedRequest = new WriteReq(chunk, encoding, cb);
-    if (last) {
-      last.next = state.lastBufferedRequest;
-    } else {
-      state.bufferedRequest = state.lastBufferedRequest;
-    }
-    state.bufferedRequestCount += 1;
-  } else {
-    doWrite(stream, state, false, len, chunk, encoding, cb);
-  }
-
-  return ret;
-}
-
-function doWrite(stream, state, writev, len, chunk, encoding, cb) {
-  state.writelen = len;
-  state.writecb = cb;
-  state.writing = true;
-  state.sync = true;
-  if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite);
-  state.sync = false;
-}
-
-function onwriteError(stream, state, sync, er, cb) {
-  --state.pendingcb;
-  if (sync) processNextTick(cb, er);else cb(er);
-
-  stream._writableState.errorEmitted = true;
-  stream.emit('error', er);
-}
-
-function onwriteStateUpdate(state) {
-  state.writing = false;
-  state.writecb = null;
-  state.length -= state.writelen;
-  state.writelen = 0;
-}
-
-function onwrite(stream, er) {
-  var state = stream._writableState;
-  var sync = state.sync;
-  var cb = state.writecb;
-
-  onwriteStateUpdate(state);
-
-  if (er) onwriteError(stream, state, sync, er, cb);else {
-    // Check if we're actually ready to finish, but don't emit yet
-    var finished = needFinish(state);
-
-    if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {
-      clearBuffer(stream, state);
-    }
-
-    if (sync) {
-      /*<replacement>*/
-      asyncWrite(afterWrite, stream, state, finished, cb);
-      /*</replacement>*/
-    } else {
-        afterWrite(stream, state, finished, cb);
-      }
-  }
-}
-
-function afterWrite(stream, state, finished, cb) {
-  if (!finished) onwriteDrain(stream, state);
-  state.pendingcb--;
-  cb();
-  finishMaybe(stream, state);
-}
-
-// Must force callback to be called on nextTick, so that we don't
-// emit 'drain' before the write() consumer gets the 'false' return
-// value, and has a chance to attach a 'drain' listener.
-function onwriteDrain(stream, state) {
-  if (state.length === 0 && state.needDrain) {
-    state.needDrain = false;
-    stream.emit('drain');
-  }
-}
-
-// if there's something in the buffer waiting, then process it
-function clearBuffer(stream, state) {
-  state.bufferProcessing = true;
-  var entry = state.bufferedRequest;
-
-  if (stream._writev && entry && entry.next) {
-    // Fast case, write everything using _writev()
-    var l = state.bufferedRequestCount;
-    var buffer = new Array(l);
-    var holder = state.corkedRequestsFree;
-    holder.entry = entry;
-
-    var count = 0;
-    while (entry) {
-      buffer[count] = entry;
-      entry = entry.next;
-      count += 1;
-    }
-
-    doWrite(stream, state, true, state.length, buffer, '', holder.finish);
-
-    // doWrite is always async, defer these to save a bit of time
-    // as the hot path ends with doWrite
-    state.pendingcb++;
-    state.lastBufferedRequest = null;
-    state.corkedRequestsFree = holder.next;
-    holder.next = null;
-  } else {
-    // Slow case, write chunks one-by-one
-    while (entry) {
-      var chunk = entry.chunk;
-      var encoding = entry.encoding;
-      var cb = entry.callback;
-      var len = state.objectMode ? 1 : chunk.length;
-
-      doWrite(stream, state, false, len, chunk, encoding, cb);
-      entry = entry.next;
-      // if we didn't call the onwrite immediately, then
-      // it means that we need to wait until it does.
-      // also, that means that the chunk and cb are currently
-      // being processed, so move the buffer counter past them.
-      if (state.writing) {
-        break;
-      }
-    }
-
-    if (entry === null) state.lastBufferedRequest = null;
-  }
-
-  state.bufferedRequestCount = 0;
-  state.bufferedRequest = entry;
-  state.bufferProcessing = false;
-}
-
-Writable.prototype._write = function (chunk, encoding, cb) {
-  cb(new Error('not implemented'));
-};
-
-Writable.prototype._writev = null;
-
-Writable.prototype.end = function (chunk, encoding, cb) {
-  var state = this._writableState;
-
-  if (typeof chunk === 'function') {
-    cb = chunk;
-    chunk = null;
-    encoding = null;
-  } else if (typeof encoding === 'function') {
-    cb = encoding;
-    encoding = null;
-  }
-
-  if (chunk !== null && chunk !== undefined) this.write(chunk, encoding);
-
-  // .end() fully uncorks
-  if (state.corked) {
-    state.corked = 1;
-    this.uncork();
-  }
-
-  // ignore unnecessary end() calls.
-  if (!state.ending && !state.finished) endWritable(this, state, cb);
-};
-
-function needFinish(state) {
-  return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;
-}
-
-function prefinish(stream, state) {
-  if (!state.prefinished) {
-    state.prefinished = true;
-    stream.emit('prefinish');
-  }
-}
-
-function finishMaybe(stream, state) {
-  var need = needFinish(state);
-  if (need) {
-    if (state.pendingcb === 0) {
-      prefinish(stream, state);
-      state.finished = true;
-      stream.emit('finish');
-    } else {
-      prefinish(stream, state);
-    }
-  }
-  return need;
-}
-
-function endWritable(stream, state, cb) {
-  state.ending = true;
-  finishMaybe(stream, state);
-  if (cb) {
-    if (state.finished) processNextTick(cb);else stream.once('finish', cb);
-  }
-  state.ended = true;
-  stream.writable = false;
-}
-
-// It seems a linked list but it is not
-// there will be only 2 of these for each stream
-function CorkedRequest(state) {
-  var _this = this;
-
-  this.next = null;
-  this.entry = null;
-
-  this.finish = function (err) {
-    var entry = _this.entry;
-    _this.entry = null;
-    while (entry) {
-      var cb = entry.callback;
-      state.pendingcb--;
-      cb(err);
-      entry = entry.next;
-    }
-    if (state.corkedRequestsFree) {
-      state.corkedRequestsFree.next = _this;
-    } else {
-      state.corkedRequestsFree = _this;
-    }
-  };
-}
\ No newline at end of file
diff --git a/node_modules/through2/node_modules/readable-stream/package.json b/node_modules/through2/node_modules/readable-stream/package.json
deleted file mode 100644
index d77b090ec..000000000
--- a/node_modules/through2/node_modules/readable-stream/package.json
+++ /dev/null
@@ -1,37 +0,0 @@
-{
-  "name": "readable-stream",
-  "version": "2.0.6",
-  "description": "Streams3, a user-land copy of the stream library from Node.js",
-  "main": "readable.js",
-  "dependencies": {
-    "core-util-is": "~1.0.0",
-    "inherits": "~2.0.1",
-    "isarray": "~1.0.0",
-    "process-nextick-args": "~1.0.6",
-    "string_decoder": "~0.10.x",
-    "util-deprecate": "~1.0.1"
-  },
-  "devDependencies": {
-    "tap": "~0.2.6",
-    "tape": "~4.5.1",
-    "zuul": "~3.9.0"
-  },
-  "scripts": {
-    "test": "tap test/parallel/*.js test/ours/*.js",
-    "browser": "npm run write-zuul && zuul -- test/browser.js",
-    "write-zuul": "printf \"ui: tape\nbrowsers:\n  - name: $BROWSER_NAME\n    version: $BROWSER_VERSION\n\">.zuul.yml"
-  },
-  "repository": {
-    "type": "git",
-    "url": "git://github.com/nodejs/readable-stream"
-  },
-  "keywords": [
-    "readable",
-    "stream",
-    "pipe"
-  ],
-  "browser": {
-    "util": false
-  },
-  "license": "MIT"
-}
diff --git a/node_modules/through2/node_modules/readable-stream/passthrough.js b/node_modules/through2/node_modules/readable-stream/passthrough.js
deleted file mode 100644
index 27e8d8a55..000000000
--- a/node_modules/through2/node_modules/readable-stream/passthrough.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = require("./lib/_stream_passthrough.js")
diff --git a/node_modules/through2/node_modules/readable-stream/readable.js b/node_modules/through2/node_modules/readable-stream/readable.js
deleted file mode 100644
index 6222a5798..000000000
--- a/node_modules/through2/node_modules/readable-stream/readable.js
+++ /dev/null
@@ -1,12 +0,0 @@
-var Stream = (function (){
-  try {
-    return require('st' + 'ream'); // hack to fix a circular dependency issue when used with browserify
-  } catch(_){}
-}());
-exports = module.exports = require('./lib/_stream_readable.js');
-exports.Stream = Stream || exports;
-exports.Readable = exports;
-exports.Writable = require('./lib/_stream_writable.js');
-exports.Duplex = require('./lib/_stream_duplex.js');
-exports.Transform = require('./lib/_stream_transform.js');
-exports.PassThrough = require('./lib/_stream_passthrough.js');
diff --git a/node_modules/through2/node_modules/readable-stream/transform.js b/node_modules/through2/node_modules/readable-stream/transform.js
deleted file mode 100644
index 5d482f078..000000000
--- a/node_modules/through2/node_modules/readable-stream/transform.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = require("./lib/_stream_transform.js")
diff --git a/node_modules/through2/node_modules/readable-stream/writable.js b/node_modules/through2/node_modules/readable-stream/writable.js
deleted file mode 100644
index e1e9efdf3..000000000
--- a/node_modules/through2/node_modules/readable-stream/writable.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = require("./lib/_stream_writable.js")