added vrdemo1.py, a script for the first live demo of the arena projection mapping.
statrted camera calibration script, which relies on the floor being perpindicular to the camera orientation.
minor changes
changed vicon to Vicon object, to simplify use and make it more consistent with rest of API.
minor changes
camCalib.py now works and responds to keyboard input, but does not display text feedback directly on the screen.
explicitly added opacity values to the wavefront material import function, because I was getting some weird blending effects.
uncommented blend function in scene.py and added a timer to temporarily hide window so camera parameters can be checked on console in the lab setup.