Making Bouncer's Django code PEP8 compliant.

@pmclanahan @fwenzel I've run check.py on this code, and verified that all of the code we wrote (excluding the migrations) is now PEP8 compliant. Please review, and let me know if you have questions/concerns.

This is low priority, as I'm going to France for a week and won't be working on this until I get back.