Adding support for Django 1.6

Horizon and django_openstack_auth 1.1.4 are both now compatible
with Django 1.6.  Bumping versions of Django to include 1.6 and
django_openstack_auth to force a Django 1.6 compatible version.

Partially-implements blueprint django-1point6

Change-Id: Id753ffa53d2484dab39e530de0a41e85f9e07742
Merge "Adding support for Django 1.6"