Fix Amazon Silk detection in Y.UA.

Amazon updated the UA string as specified here:
http://docs.aws.amazon.com/silk/latest/developerguide/user-agent.html
fixes #1431: Removing 'scoped from 'style' blocks in all library example .mustache files
Build yui.
Update yui history.
Add missing link.
merging dev-master into local branch
YUI and Loader build for latest Gallery build
Finishing the removal of scoped from style blocks started in pr#1577