General fixes to upsampling.
Cleanup and added unit test.
Removed some precision loss that was incurred during upsampling.
Added edgeIndices tests to unit test.
Merge remote-tracking branch 'agi/master' into quantizedMeshUpsampleFixes

Conflicts:
	Source/Workers/upsampleQuantizedTerrainMesh.js
Updated Changes.MD
Minor tweak to add clarity to edgeIndex binning.
Improve EllipsoidGeometryUpdater performance

The fast path for dynamic ellipsoids in the DataSource layer was not
checking the value of instance attributes before setting them, leading to
a large slowdown in performance.  With 170 time-dynamic ellipsoids,
this went from 15 fps to 100.
Merge pull request #2320 from AnalyticalGraphicsInc/dynamic-ellipsoid-performance

Improve EllipsoidGeometryUpdater performance
Fixed use of local rectangle variables in upsample worker. Cleanup.
Merge pull request #2318 from abwood/quantizedMeshUpsampleFixes

Quantized mesh upsample fixes