Add CCRenderer support for Cocos3D rendering.

Make CCRenderCommand protocol public. Rename CCRenderCommand invoke: method to
invokeOnRenderer: for more clarity as public protocol applicable to any object.
Add CCRenderer enqueueRenderCommand: method.
Set COCOS2D_VERSION to 0x00030100 so Cocos3D can detect new rendering.
Merge branch 'develop' of https://github.com/billhollings/cocos2d-iphone into develop