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.
Remove frustum allocation each frame.
Update doc.
Set shadow properties on cloned frustums to undefined to force matrix updates.
Set shadow properties to undefined.
Merge pull request #1346 from AnalyticalGraphicsInc/frustum

Remove frustum allocation each frame.
Merge branch 'master' into preprocess