Added files from HackMIT.
Cleaned and commented tester.py.
Added naive_bayes_predictor.

It is still the case that naive Bayes is doing as well or better than
the perceptron learning algorithm.
findAuthor.py tests perceptron and then naive Bayes. Can compare scores.

Perceptron 77.7% with 10 epochs, naive Bayes 87.7%...