added dontRecomposite
SuspendEvents also suspends recompositing on CompositeDynamicObjectCollection
Issue: https://github.com/AnalyticalGraphicsInc/cesium/issues/1452
make `shouldRecomposite` 'private' as `_shouldRecomposite`
performance fixes
Update CHANGES.md
Fix camera tilt in ICRF.
Update CHANGES.md.
Tweak CHANGES.md
Merge pull request #1516 from AnalyticalGraphicsInc/tiltICRF

Fix camera tilt in ICRF.
Remove unused modules.

Also sort modules, remove a few unused other variables, whitespace cleanup.
Merge pull request #1517 from AnalyticalGraphicsInc/removeUnusedModules

Remove unused modules.
TimeIntervalCollection, DataSourceCollection, BillboardCollection, ImageryLayerCollection, LabelCollection, PolylineCollection, SensorVolumeCollection
Update CHANGES.md
Remove proxy from most default imagery providers.

ESRI and OpenStreetMap (OSM, Stamen, and MapQuest) all now support CORS headers directly.

Also remove `FeatureDetection.supportsCrossOriginImagery` and related checks which only applied to old WebKit versions (Safari before version 6).
Add polyline loops.
Add Sandcastle example.
Add tests.
Update CHANGES.md.
Tweak CHANGES.md
Add second parameter to Material.fromType to override default uniforms.