Define thorax knownHelpers
Merge commit '8524fbb0821dc4f33d90b948ea6649813d38fe65'

Conflicts:
	components/thorax/lib/zepto.js
	components/thorax/lumbar.json
	components/thorax/src/collection.js
	components/thorax/src/helpers/collection.js
	components/thorax/src/loading.js
	components/thorax/test/src/collection.js
Update to latest handlebars libs
Remove sneaky variable