Basic CAS authentication interactions, starting #11.
Bare-bones membership model, management, checking for #11.
Features api endpoint.
Force tag push on deploy so never rejected.
Modded django_cas broke on deploy, but normal django_cas works.

We definitely dodged a bullet on this one... I was worried that
all of our auth stuff was doomed to fail because of the
combination of the Python bug with sslv3-only servers and
AppEngine's disallowing the ssl module (used in USG's fix to
django_cas).
Merge branch 'master' into facilities

Conflicts:
	colonial/models.py