A baby version of the sentiment analyzer.

In the current state, this program will train on the movie_review corpus
provided by NLTK which is exactly 2000 files, 1000 positive and 1000 negative.

With the specified path, it will go through each file in the directory and
classify them, outputting the filename and its sentiment rating.

Line 10 and 11 is the foundation we need to implement our own corpora later
down the line when we have tweet data.