Merge pull request #2 from rjurney/master

Stanford Tokenizer works, filtered tokens < 3 chars
updated tokenization udfs (now does ngrams, uses newer version of lucene), modern tfidf macro that works with pig 0.12
macro for similarity; cosine similarity
Working Stanford POS tagger.
Merge branch 'master' of github.com:Ganglion/varaha
Merge branch 'master' of github.com:rjurney/varaha