Batches toCSS output for animations with no optimizable keyframes.

Squashed commit of the following:

commit 45fe52027de2a5f31a7fb4ee85a4d2db17a23ff3
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Mon Sep 2 20:26:26 2013 -0700

    Builds and tags 0.15.17.

commit 82ea5b3a4e27ac6d45006a3050a8a1c7aa6bc22b
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Mon Sep 2 20:06:05 2013 -0700

    Prevents unneeded CSS tracks from being generated.

commit 6f3da366fca5d7d7bf26ac1c72515d18381d99a8
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Mon Sep 2 19:47:11 2013 -0700

    Passes test for generateAnimationNameProperty.

commit ae72235d2fedec87d2bcc1c7be1e94fc8440a518
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Mon Sep 2 17:50:26 2013 -0700

    Adds a failing test, rewires function parameters for property combination.

commit d02b930e7b23ab8c7bbd91dcea1e7cd52c2c65d1
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Mon Sep 2 17:17:42 2013 -0700

    Rewrites and integrates generateCombinedActorKeyframes.

commit aa78bcbd625bf75dfe4c45d575aa3c03fdef911b
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Mon Sep 2 16:10:20 2013 -0700

    Adds more tests for canOptimizeAnyKeyframeProperties.

commit ee3704a3a83907d4664ee77a34f60b5a650b3a28
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Mon Sep 2 11:18:09 2013 -0700

    Starts on generateCombinedActorKeyframes.

    Reorders parameters for generateActorTrackSegment.

commit b9380ee12087bf51812b03726533f947090df51b
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Mon Sep 2 10:57:57 2013 -0700

    Adds and tests canOptimizeAnyKeyframeProperties.