Adds clear function to crtp rig.
Adds setparam function to crtp cameras.
Adds camera calibration derivatives for atan and linear camera models
Adds ImageSize() to crtp cameras.
Modifies param setting/getting.
Merge remote-tracking branch 'origin/master' into self_cal

Conflicts:
	include/calibu/cam/camera_crtp.h
	include/calibu/cam/camera_crtp_interop.h
	include/calibu/cam/camera_models_crtp.h
Adds iostream for cerr. Googlifies opening braces.
Merge pull request #5 from arpg/self_cal

Merges the Self_Cal calibu camera models.