Processing times update

This is a cleaner version of #279. Updates stats model with less than one flag, load_agency_contacts, and tests.

**The 0016_cleaning_stats.py migration started breaking when I updated the model so I moved things around, not sure if it's kosher in this case.**
Looks like this migration is removed, which is probably fine. However, have you run this set of migrations on a database that has this migration applied to it? Does that work out fine?