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
Set scripts as executable and add shebangs
Refactoring preparations
Alter print formatting to work with 2.6
Move CREATED_AT and to_date to tweet module
Move constants from tweetstore to tweet
Prefix private variables with underscores
Replace count/retrieved abuse with return statement
Simpler tweet filtering in search