Started refactoring the database lib for social graphs and writing unit tests
removed sqlite file accidently added
initial unit test working
More unit tests for database, fixed an error with tweet insert sql

Some refactoring in tweet_handler.py
Moved database file to use shelve. Not tested yet
Updated tests to suit new database structure. I know that this breaks the test-driven-development philosopy :(
Merge branch 'master' of https://github.com/benjamin-croker/twerpy into nosql
Started work on transferring to NoSQL database. The analysis.py module needs work
working with nosql database, but full unit testing is needed