Merge pull request #1 from RaresAmbrus/master

Adding rgbd_grabber to the 3d_annotation_tool. Looking good!
fixed rgd & depth synchronization by adding a buffer and saving images only when they have been matched. Changed the format of the depth image from 32 to 16 bit. Added a command line paramenter _saveMismatched to indicate whether to save all the images or only those with a match