Small updates and bug fixes
Implemented suggested fixes to make mcptam work on OSX and ROS Indigo.
Fixed problem with VideoSourceSingle where it was writing bad data to the camera's set info service when it failed to receive a proper CameraInfo message (like when first calibrating a new camera).
Added a feature to CameraCalibrator that lets you use the camera's current calibration when searching for checkerboard points, rather than assuming that checkerboard corners are located 90 degrees from one another. This better supports cameras with very large FOV when the checkerboard is near the edge of the image.