Adding realtime to explore mode.
Merge pull request #293 from mithro/simple-realtime

Basic "real time" mode (previous called "manual" mode)
Add a test that keyframe property values are stringified
Merge pull request #338 from steveblock/keyframeToString

Add a test that keyframe property values are stringified
Fixing the generator as discuss in the testing meeting.
Implemented pauseAnimationsForTesting and test-pause-for-testing.
Merge pull request #336 from rjwright/pauseForTesting

Implemented pauseAnimationsForTesting + test.
Remove handling of zero property-specific keyframes

This case should never occur.
Add test for type of Animation.effect when created with a keyframe dictionary
Handle null property values in keyframes

Also add a test that invalid property values are ignored
Don't add composite or neutral as CSS properties of KeyframeInternal

Also add a couple of asserts for compositing.
Merge pull request #339 from steveblock/keyframeFixes

A few minor tweaks and bug fixes for KeyframeAnimationEffect
Add videos for testing MediaReference

This will be published on a gh-pages branch to allow them to be served by
github. See
https://github.com/web-animations/web-animations-js/pull/316#issuecomment-20329158
Merge pull request #340 from steveblock/videosForTesting

Add videos for testing MediaReference
Fix MediaReference after switch to new Timing interface

This was broken by 5ee65b94527a1c0808d89f2ba229d88303310332 and following commits.

Also fix the test after the switch to the new testing framework.
Fix MediaReference to stop the media when detached from its Player
Merge pull request #316 from steveblock/mediaRefSubmission

Fix MediaReference after switch to new Timing interface
Implement accumulate for KeyframeAnimationEffect
Merge pull request #335 from steveblock/accumulate

Implement accumulate for KeyframeAnimationEffect
Add a test that applying accumulation takes immediate effect