Don't look at any of the code from this commit

That goes for future me and any unassuming visitors. You’ve been warned

~srs~
- added some training images for cascade classification
- ocr.py is a set of classes with methods for doing arbitrary ocr.
currently only have data sets for digits and english alphabet, but we
can perhaps generate a set from programmatically distorting a set of
2-3 fonts of a language or symbol alphabet.
- i need to learn to OO in python
- digit_positives.py outputs 5000 20-by-20px images of digits from
digits.png for cascade classification training
- rename ocvattempts.py&mathocr.py -> webcam.py
- webcam.py displays video stream from the default video streaming
device. has various options, specifically the new option ’t’
enables/disables motion tracking