ADD 3 Sentiment lexicon data structure that implement OpinionDictionary
AFINN11
	http://www2.imm.dtu.dk/pubdb/views/publication_details.php?id=6010
LexiconHuLiu
	http://www.cs.uic.edu/~liub/FBS/sentiment-analysis.html
SentiWord
	http://sentiwordnet.isti.cnr.it/