Use the latest Django 1.4 release to test
Use the latest Django 1.4 release to test

This patch modifies tox.ini file to use the latest Django 1.4
release to test django-openstack-auth.

Change-Id: I6b9203d02aee79339f933eef5765de76901d2ecb
Closes-Bug: #1308123

dan1/django_openstack_auth_proto,promptworks/django_openstack_auth,promptworks/django_openstack_auth,ging/django_openstack_auth,redhat-openstack/django_openstack_auth,ashokkumarprajapati/openstack_auth_remote,ging/django_openstack_auth,redhat-openstack/django_openstack_auth,jamielennox/django_openstack_auth,dan1/django_openstack_auth_proto