Images Mirroring and other control for Kinect 

I tried to make the suppot for mirroring on Kinect Device.
It works fine on my computer, hope someone could test this.

I also add some property to enable the control of Kinect: 
KINECT_DEVICE_PROPERTY_CAMERA_ELEVATION
KINECT_DEVICE_PROPERTY_ACCELEROMETER
KINECT_DEPTH_PROPERTY_NEAR_MODE

If it wroks, I hope this could be merged into next release of OpenNI.