Graphing, lots of cleanup/fixes

- Added GraphMetric for graphing general things (e.g. things that would
not exist in the DB otherwise)
- Added syncdb to fabric allowing you to quickly get a hydr0 DB dump on
your local machine
- Added index on steamed to User, migration included
- Added some metric-tracking in crawler for steam community status
- Fixed a code smell in build_single_daily_mipp
- Cleaned up old migrations and added doctoring to migrations/develop.py
- Cleaned up run.py, added “once” command for running one-off scheduled
tasks
- Added truncate_graphs scheduled task and utilities for keeping
GraphMetrics clean
- Added with_timing utility function
- Added proper logging support