Add anonymizer files for django-anonymizer

Not sure if you are interested in this being in the project but we use django-anonymizer to allow us to make a copy of the database which is minimally dangerous to hand out to trusted parties for development and testing.

The process we use is on a non-production server with django-anonymizer installed:

1. Load a copy of our production database's most recent backup into an anonymizer database that has no use other than this.
2. Run the anonymizer: `python manage.py anonymize_data --settings=app_name.anonymizer_settings` # This settings file points to the anonymizer database
3. Truncate some tables that we don't actually need in other places (such as django_session and django_admin_log) and some things that don't transfer well (such as avatar_avatar)
4. Dump the anonymizer database and distribute.