Merge pull request #11 from Lucas-C/master

Added support for French + better NLTK stemmers import
Fixed syntax error - I think nobody use this :)
Throw LookupError on unknown stop-words language
Raise LookupError on unknown language for stemmer
Updated changelog
Typo: yes, I used C&P again
Adding --stopwords-file option + refactoring & testing Ã __main__.py