First cut of CZML vector support.
Merge branch 'master' into vectors
Specs, cleanup, and fixes for CZML vectors.
Remove unneeded scratch objects and clean up some getValue usage.

In reality, MockProperty needs to be overhauled and maybe replaced, but that's outside the scope of this pull.
Whoops. Fix bad submit.
Upgrade JSHint to 2.1.2.

Matches version included in the latest Eclipse-JSHint plugin.
Fix failing test.
Merge pull request #809 from AnalyticalGraphicsInc/upgradeJSHint

Upgrade JSHint to 2.1.2.
Fix date parsing when using a UTC offset in extended format (+-00:00)
Merge pull request #810 from AnalyticalGraphicsInc/fixDateParsing

Fix date parsing when using a UTC offset in extended format (+-00:00)
Merge pull request #806 from AnalyticalGraphicsInc/vectors

CZML Vectors
Fix polyline arrow appearance.

@bagnell suggested this change to prevent arrows from completely disappearing in certain camera views.
Merge pull request #811 from AnalyticalGraphicsInc/fixPolylineArrow

Fix polyline arrow appearance.
Remove unused modules.
Merge pull request #812 from AnalyticalGraphicsInc/cleanupImports

Remove unused modules.
Update CHANGES for recent pull requests we forgot to add.
Added VAO support
Updated CHANGES.md
Removed old VertexArray code
Fixed systems without VAOs