micro-optimizations
Merge branch 'master' of github.com:clips/pattern into origin
sentiment analysis update

- Updated the sentiment algorithm to use language-specific tokenization. In other words, for French it uses the French tokenizer and splits "j'" from words, so that "aime" is recognized in "j'aime". In English it uses the English tokenizer, sot that "'m" is split from words, and so on.
- sentiment() now also takes Documents and Vectors (e.g. it takes into account the feature weights  of bag-of-words).
- bug fixes