Refactoring image.ROI and image.Stack
Clean up image.Stack.__init__ and image.fromFile()/image.fromBackground()
Rename fplot.sharex()=>fplot.twinxaxis()
Use fcalc.fret_counts() in test_fcalc
Changing object instantiation to use 'meta' argument instead of '**meta' kwargs
setup.cfg to use new 'passing' tests... yes I know...
Add work functions to fec.py
Remove fec.make_masks()