Modify projectTo2D to take attribute names.
Assume that any attributes whose component data type is double needs to be projected to 2D and split for RTE.
Add PolylineGeometry.
Add polyline color and material appearances.
Generate compute functions based on scene mode for polyline position and adjacent positions.
Modify PolylineCollection to use common polyline shader code.
Create polyline geometry on a web worker.
Add polyline geometry to Sandcastle example.
Update doc.
Add polyline geometry and appearances tests.
Update CHANGES.md.
Updates based on review.
Merge branch 'master' into polylineGeometry

Conflicts:
	CHANGES.md
Add per vertex and per segment color to polyline geometry.
Add polyline color tests.
Add per vertex/segment colors to simple polyline geometry. Added/updated tests. Updated geometry Sandcastle example.
Merge branch 'master' into polylineGeometry
Updates based on review.
Merge pull request #1115 from AnalyticalGraphicsInc/polylineGeometry

Polyline geometry