Added animation start and end events to menu sheet extension
data.ack was incorrectly always true
Removed animation events for source
Merge pull request #476 from SpiderOak/menusheet-animation-events

Added animation start and end events to menusheet extension
Some clean up on code and demos html. Added .black-translucent for menu-sheet.
Merge pull request #469 from senchalabs/issue-469-cleanup-for-b5

Code clean up for b5
Merge pull request #471 from senchalabs/issue-471-grunt-build

Use `grunt` for build.
Fixed zepto path.
Merge branch 'master' into HEAD