requirements: add psycopg2 for Heroku
settings: add support for Mandrill SMTP
settings: Allow setting DJANGO_ADMINS from environment
Use default email backend
settings: don't use root@localhost for error emails
settings: allow setting email domain from environment
settings: set ALLOWED_HOSTS from environment
settings: read X-Forwarded-Proto header

... and switch on a couple of CSRF cookie protection options
Upgrade to Django 1.6
settings: configure static file serving for Heroku