Ignore virtualenv environment.
Add debug function for output.
Add last_modified field, changed init for DB (DANGEROUS).
Add timestamp to database input.
Terminology change: "user" -> "redditor".
Add method to retrieve submissions from redditor.
Refactor some duplicated code.
Add 'refs' to redditors and subreddits tables.

It keeps track of which ones we've seen the most references to,
so we know which to visit next.
Save references to redditors.
Split redditor changes into inserts and updates.

Otherwise we'd clobber our timestamps.
Add debug_silence method to hide debug calls.
Add process_redditor() and its accoutrements.
Add top level script for database pull.
Fix a couple of bugs.
Add 'meta' table to mark DB as seeded.
Rewrite master.py.
Tweaks to adjust performance.