SKPolygraph podspec added

This is a CocoaPod that can be used for simple sentiment analysis of an English text. Sentiment analysis aims to determine the attitude of a speaker or a writer with respect to some topic or the overall contextual polarity of a text. Simply put it tells you whether the text is "happy" or "sad".

For instance "It was a good sunny day" will score 2.0 points, meaning it is a positive text and "It was rainy and cold day" will be graded as negative.