Modify WallGeometry to follow the template of other geometry types.
Add normal, tangent, binormal, and texture coordinate attributes to WallGeometry.
Update tests.
Merge branch 'batching' into wallGeometry
Updates after review.
Update wall Sandcastle example and add temporary wall to CesiumViewer for testing.
Added EllipsoidSurface appearance
Fixed tests
Created types for apparances
Re-order wall positions.
Merge branch 'batching' into wallGeometry
Wall fixes
Removed unused parameter
Merge pull request #820 from AnalyticalGraphicsInc/wallGeometry

Finish WallGeometry