Ambient light workaround
Update CHANGES.md
Merge remote-tracking branch 'origin/master' into lighting

Conflicts:
	CHANGES.md
Merge pull request #1680 from AnalyticalGraphicsInc/lighting

Improve lighting
Added deprecationWarning
Update doc
Use spyOn
Mark deprecationWarning as private.
Merge pull request #1681 from AnalyticalGraphicsInc/deprecationWarning

Added deprecationWarning
Merge branch 'master' into pick-terrain