Some more changes to make the code more c++ friendly:

- nodeToParentTransform -> getNodeToParentTransform() (the same for its friends)
   - Deprecates the old methods
   - adds 'consts' to those methods
- boundingBox() -> getBoundingBox()
   - the new one is const
   - Deprecates the old method.
- Adds overrides keywords in CCNodeRGBA and CCArmature
- AffineMatrix are mutables