* added environment mapping (still needs some tweaking)
* refactored nodecamera, still needs to fix lazy inverse view calculation maybe
* added full support for cubemapped textures
* Fixes for environment mapping
* Camera fixes for lazy transform recalcs
* Added GLKit dependency to all sample targets--iOS 5 minimum now required
* Added Quaternion rotation support for rotation animation (need to remove euler calculations)
* integrated bullet physics
* much improved physics integration, supports scale, concave bodies
fixed material lighting, texture lighting needs parameterized
* corrected gouraud shader issues, added phong per pixel shader