Add class method count_hashtags to User class, which counts ALL hashtags used in X recent tweets.

Count_hashtags returns a dictionary of hashtags and counts.
Simplescore will do the work of comparing the hashtags against the database. WIP
Create working module that scores user hashtags by comparing hashtags to political hashtags from db.

Creates dict of matches against political hashtags (querying database Hashtag table)
Scores by number of political hashtags out of total num hashtags.
Returns float number between 0 and 1.
Import politwit.model - moved model into politwit dir