Definition: Given a 'poster' sentence and a corresponding 'response' (often, from Facebook or Reddit)classify the sentiment of the given response into four categories: 1) Positive, 2) Negative, 3) Neutral, and 4) Mixed if it contains both positive and negative.
Input: Poster: Release date for #Riddick Sept 6th 2013!!!!  Responser: O_o had no idea there was going to be another one. Butchers Bay is an awesome video game, a classic.
