Add primitive classifier
A quick and dirty search prototype

Nothing is being stored yet. Both storage & paging still need to be
done.
Add paging to our search experiment
Use python's list argument magic
Use python's 'with' to handle files
Use apply_features to avoid running out of memory in training
Keep POS/NEG "constants" simple
Document __get_string_features
Add an import script for the provided tweets
Indices on mongodb: "created_at", "id"

In order to handle insertions of duplicate ids, we enable
continue_on_error and ignore DuplicateKeyError exceptions.
Increase the AIC import chunk size
Handle tweets without "created_at" fields
Move evaluation code into classifier
Add rudimentary support for tweets to classifier
Add small script to classify tweets from DB
Pull feature selection into its own class
Add hashtag feature selection and composite selections
merged  twentyment.py and search.py
Remove {twentyment,search}.py

Both have been merged into gettweets.py.
Initial README content