RegionBuilder - now an OpenNI application
    
    RegionBuilder
    	integrated KinectViewer
    	added main loop for display update
    	added communication w/GUI for shutdown
    	pass coordinate selections down to GUI
  	MainScreen
  		no longer knows about the Kinect
  		no longer creates location selector
  		communicates shutdown back to main loop
  		accept coordinates from main loop
  	KinectViewer
  		new OpenNI based module to maintain a
  		kinect session, extract depth data, 
  		display the depth image, accept mouse
  		clicks, and map them into location selections.
  	SamplesConfig.xml
  		basic Kinect cfg for use w/OpenNI