Pack position attributes with rotation and scale.
Compress pixel offset, direction, horizontal origin, vertical origin, show, and translate into 3 floats.
Initial compression of eye offset, aligned axis, translucency by distance, color and pick color.
Only decompress attributes if they're used. Fix aligned axis encoding error when undefined.
Fix encoding aligned axis.
Remove eye offset compression.
Compress billboard texture coordinates.
Compress and pack image dimensions.
Fix translucency by distance decompression.
Merge branch 'master' into billboardCompression
Fix translucency by distance tests.
Add comments about what each compressed attribute contains.
Only unpack the color that will be used when the pass is either pick or color.
Remove old comment
Updated CHANGES.md
Remove purpose from vertex array facade.
Move constant pow evaluations to actual constants.
Fix multi-frustum test.
Merge remote-tracking branch 'origin/master' into billboardCompression
Pass CesiumWidget.clock option in through Viewer constructor.

Also fixed a related bug when multiple animation widgets are in use.