VaderSentimentJava-1.1.1

• Optimization fixes by @ArjohnKampman
• Updated MVN dependencies and checkstyle

VaderSentimentJava-1.0.1

This version implements NLTK's version of VADER Sentiment Analyzer.
I added checkstyle to the project so that it becomes more extensible and can have a better design.

There were minor refactorings for better performance e.g. using sets in place of arrays and lists for searching.