Easing changes
Merge pull request #41 from web-animations/finalChanges

Easing changes
Add a playback-control demo
Merge pull request #42 from dstockwell/playback-control

Add a playback-control demo
Allow individual demos to customize polyfill/native text
Merge pull request #43 from dstockwell/custom-text

Allow individual demos to customize polyfill/native text
Add galaxy demo.
Merge pull request #44 from dstockwell/galaxy

Add galaxy demo.
Merge remote-tracking branch 'upstream/master' into HEAD
Update components.