Adding a WSGI app to our Django project.

This is required due to our move to Django 1.6. See the Django docs at
https://doc.djangoproject.com/en/1.6/howto/deployment/wsgi/#upgrading-from-django-1-4
Added module names on imported exceptions
Added CSRF tokens to all of the POST requests off web forms

This is enforced stricter by Django 1.6. Also, made sure that we
use `<form method="post" ...>` with lower-case `post`. There were
a few `POST`s in CSRF-offending lines in there, and my initial grep
of course missed them!
Merge branch 'master' of https://github.com/SeattleTestbed/clearinghouse