Removed hardcoded square size and output filename so --gridsize and --calibrationfile are respectied, added --capturewidth and --captureheight to set the size of the images captured from the camera, shortened overly verbose help messages, fixed spelling error, lowercase the word "chessboard" in help messages
Merge pull request #533 from lazd/calibratetool

Fixes, cleanup, and additional command line parameters for tools/Calibrate.py