ShaderCache tweak.  Still want to do a frame count per shader at some point.
Start of debugShowCommands
Allow both debugShowFrustums and debugShowCommands
debugShowCommands test and doc
Fix tabs
Update enableLighting shadow property to detect changes.
Merge pull request #1339 from AnalyticalGraphicsInc/colorcommand

Added scene.debugShowCommands
Merge pull request #1345 from AnalyticalGraphicsInc/enableLighting

Fix CentralBody.enableLighting
Update CHANGES.md.
Merge branch 'master' into sorting
Updates from review.
Fix tests.