WIP: Integrating django-secure

For background info, please see the [django-developers thread](https://groups.google.com/d/topic/django-developers/t8ybImtdnpM/discussion).
Should this be `>= 50` since the `startproject` command is `options['secret_key'] = get_random_string(50, chars)`?

(previously commented on an outdated diff)