Merge branch 'master' into dynamicScene-es5-properties

Conflicts:
	CHANGES.md
Add NearFarScalar support to DynamicBillboard

1. Implement Packable in NearFarScalar so that it can be a sampled property.
2. Add nearFarScalar property to DynamicBillboard
3. Hook up the visualizer.
4. Specs for everything.
Merge remote-tracking branch 'origin/dynamicScene-es5-properties' into dynamicBillboard-size
Merge branch 'dynamicBillboard-size' into kml

Conflicts:
	CHANGES.md