Fix device registered point cloud generation#4

Merged

jonbinney merged 2 commits intoros-drivers:hydro-develfrom piyushk:fix_device_registered_cloud

Aug 1, 2013

+42-19

Commits on Jul 30, 2013

fixing xyzrgb pointcloud generation when device registration is enabled
piyushk
committed

Commits on Jul 31, 2013

disabled unregistered depth and disparity processing when depth_registration is set to true
piyushk
committed