Sentiment Analysis implemented

The method is named self.get_sentiment. It takes on parameter—(word)—which is the word you want a sentiment about. It returns positive, negative, and (maybe) neutral. It seems to only be giving positive and negative on single words. That should work for us, though, since neutral isn't all that useful of a sentiment in this context.

If we want, down the line, there's also a score available. It's the weight of how positive, negative, or neutral the word is... could be cool to mess around with later.