Added Oculus SDK (0.2.3) with Xcode project, SDK.framework (for Mac OS X), and updated Xcode project to build "out of the box".
Fixed issue with dyld being unable to locate SDL.framework.
Mac OS X 10.4 may no longer be supported.
Modified .gitignore to exclude Xcode files.
Separated the initialization of the HMD Renderer and the Oculus Rift in order to debug rendering with out an Oculus VR unit.