Massive overhaul / refactor
Changed flock to by a Flask package instead of a single module app
Added database support. Initially only storing tracked subreddits
Added some quick test views to view subreddits, subreddit charts and all charts
Added cron shell script to invoke a python script to heat the cache every day
Moved templates and static files to the flock/ package
Added a runserver.py module for running the local test debug server
Added SQLAlchemy models to represent Subreddits and Entries (Links)

Fixed a cache bug that would case cache corruption. Now all cached data is
pickeled before being added to the cache, and un-pickeled when read.

Changed template slightly to open links in a new tab / window

fixes #17
closes #6
closes #7