update web-common submodule - taler-www

commit 068fb52ffa7246b8e347aff4fd5083d9bf3db04b
parent 5947aa4f34d2481097af494d5db1b62645526c14
Author: Christian Grothoff <christian@grothoff.org>
Date:   Sat,  4 Jun 2016 12:47:16 +0200

update web-common submodule

	taler-www Main taler.net website
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