Added module init file to pupil_detectors and added default class template.
Added shared methods.
Added very rough canny detector.
Updated main to create pupil detector. (Doesn't use it yet, though.)
Fixed minor sytax error.
Ignored JPGs and PNGs.
Removed uneeded files.
Created a simple and relatively accurate pupil detector.
Removed uneeded documentation for Pupil.
Modified readme to mention Python 2 rather than Python 3.
Added a Pupil_Region class with information about the region in which a
pupil lies.