Proposed v1.8 with initial DK2 support

I've updated the Oculus SDK to 0.3.2 (the latest cross-platform version). Since it now provides appropriate distortion rendering based on the different HMDs, the VR code has been simplified and rewritten. I've added some small LibOVR hacks to get the Oculus Rift DK2 to work on OS X. I've also eliminated the well-known black smearing on the DK2. There's some initial joystick/gamepad support, tested with both PS3 and Xbox 360 controllers on OS X. The Xcode project should produce a fully-functioning application bundle/executable in one click.