Migrate to Django-based cron jobs

[bcipolli]

If we install a Django app, such as https://bitbucket.org/wnielson/django-chronograph/, we can install cron jobs as fixtures and query results as models.

I believe this would simplify our server setup workflow. It would also reduce our code footprint--we could eliminate our custom cron Django app.

Thoughts?

[adborden]

It manages it's own logs, too? Neato.