FLAGS_calibrate_imu checked before adding super frame
No camera missing error when just saving the pattern
Serial number added to cameras
-grid_preset accepts aliases as "small" and "large"
Medium-sized grid added
Merge branch 'master' into fix/superframe

Conflicts:
	src/vicalib-task.cc
Merge pull request #6 from arpg/fix/superframe

Serial number added and other minor enhancements