Added instructions for using PointGrey cameras with OpenPTrack.
Added instructions for using PointGrey cameras with OpenPTrack.

OpenPTrack/open_ptrack,OpenPTrack/open_ptrack,team-diana/swissranger_camera,chanbrown007/open_ptrack,OpenPTrack/open_ptrack,team-diana/swissranger_camera,chanbrown007/open_ptrack,chanbrown007/open_ptrack