formatting cleanups
cleanup handling of None tests
cleanup type handling
gl organization cleanups
cleanup gamma organization
cleanup imports
derpacate the getMsPerFrame function in favor of the corresponding visual.Window method
Merge pull request #379 from toddrjen/visualsplit

Cleanup window.py
Merge pull request #380 from flipphillips/master

Fixed small bug re 'semi' calibration mode.
BF: Changed DS_Store to be correctly ignored