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.
Expose WebGL context options via CesiumWidget and Viewer

Also cleaned up some Specs, particularly for Scene and added specs for context options to all three classes.
Tweak tests to pass on Firefox.
Merge pull request #866 from AnalyticalGraphicsInc/issue841

Expose WebGL context options via CesiumWidget and Viewer
Updates based on review.
Switch to minified version of dojo 1.9.

Delete uncompressed and dojox files.
Update billboard Sandcastle example.
Remove references to dojox
Merge pull request #865 from AnalyticalGraphicsInc/upgrade-to-minified-dojo

Switch to minified version of dojo 1.9.
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.