Start adding more vertex attributes to polygon geometry.
Merge branch 'batching' into polygonGeometry
Merge branch 'batching' into polygonGeometry

Conflicts:
	Source/Core/PolygonGeometry.js
Fixes after merge.
Merge branch 'batching' into polygonGeometry
More clean up after merge.
Add normal, tangent, and binormal attributes to polygon geometry.
Update and add tests.
Merge branch 'batching' into polygonGeometry
Updates based on review.
Merge pull request #837 from AnalyticalGraphicsInc/polygonGeometry

Polygon geometry