Add billboard rotation and aligned axis.
Merge branch 'master' into billboardRotation
Merge branch 'master' into billboardRotation
Merge branch 'master' into billboardRotation
Fix issue with vertical and horizontal origin. Add tests. Update Sandcastle example.
Update CHANGES.md.
Updates based on review.
Add conditional compilation in the vertex shader for billboard rotation.
Add custom width amd height to billboards.
Update CHANGES.md.
Updates based on review.
Update billboard Sandcastle example.
Remove scratch bounding sphere for 2D that made the last computed bounding sphere the same for all polylines.
Use a scratch bounding sphere per polyline.
Merge pull request #868 from AnalyticalGraphicsInc/disappearing2DPolylines

Fix polylines disapperaing in 2D.
Fixes #813
Merge pull request #859 from AnalyticalGraphicsInc/billboardRotation

Billboard Rotation
Merge remote-tracking branch 'origin/master' into dataSourceBrowser