upgrade ez_setup.py
add min/max char count of tokens in simple_preprocess as parameters
Change total_words count from an iteration over all vocab items to a simple addition.  This speeds things up a lot when processing billions of total words.
Merge pull request #139 from holopoj/develop

word2vec: Change total_words count from a function to a count
update readme docs
Merge branch 'develop' of github.com:piskvorky/gensim into develop
Merge branch 'develop' into add_perplexity

Merging upstream changes (including more efficient main loop)