Make script to construct sqlite database of business/user/review data
Add yelp.sqlite to gitignore
Add index to 'useful' column of 'review'
Remove 'out' from gitignore and change name to 'features'
Alphabetize imports in db_gen.py
Make the preprocessor use the sqlite db to compute features; compute a subset of the desired features
Delete 'features'
Add 'features' to gitignore