Updated openstack/openstack
Project: openstack/requirements  a593fb3e78d12bfb059728213ee32742d38ff104

Don't use Django 1.4.0 nor 1.4.1

Versions 1.4.0 and 1.4.1 don't have the function `force_text` which
replaces `force_unicode`, Django>=1.4.2 running in Python3 doesn't
expose `force_unicode`.

Change-Id: If15427d0cba3fd762beefaa0e956edfda003774a