Get sprites working in collage. temporary fix for docs.json issue. Looks like git thinks we're in the past, so a bunch of changes that have already happened as well.
Add some files
Merge branch 'dev' of https://github.com/evancz/Elm into dev

Conflicts:
	libraries/Graphics/Collage.elm
	runtime/Render/Collage.js
	runtime/Render/Element.js