Merge pull request #3 from t-lo/master

post_movies: rewrite, threaded, generate 'users' index
Merge pull request #4 from t-lo/master

post_movies.py: better example query
Add hetrec data.

Needed for a bit more context for content based recommendation.
Merge remote-tracking branch 'origin/master'
Merge remote-tracking branch 'upstream/master'