Try other python versions before dying in recombine step of the numpy matrix writer
BUG: Forgot to add initial zero ito indptr in one of the constructors of the numpy matrix writer
Reduce the expected number of tweets and feature size so we don't crash on launch

Need to rethink how tweet-feature extractor is going to work - I may
have to run this in batches then recombine via Python.
Fix handling of min-word-count
(2/2) Try other Python versions before dying in recombine step.

Forgot to commit this file earlier