first pass
add default function definition for supportsTileDataAvailable()
Don't crash if supportsTileDataAvailable is not defined.
use single function getTileDataAvailable() and add to other terrain providers
move profile scene
add SanFrancisco profile scene
jshint pass
Merge branch 'master' into tile-loading
move profiling test to sandcastle
update CHANGES.md
add specs for getTileDataAvailable()
test the getTileDataAvailable() false case as well
ammend documentation
Add a function to set the default EntityView vector.
Remove no longer needed IE 11 workarounds

As of IE 11.0.12 (KB2977629), many of the workarounds we have in place for IE 11 are no longer needed.
Merge remote-tracking branch 'origin/master' into default-entityView
Switch to a static getter/setter.
Update test
Fix issues with ScreenSpaceCameraController.

* Remove use of FrameState, which lagged behind a frame, causing inconsistencies between the controller and the camera.
* FrameState was being passed to Globe.pick instead of Scene.
Fix tests.