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
Switch to SQLAlchemy 0.9

After SQLAlchemy-migrate has been fixed for SQLAlchemy 0.9,
and after the last problem (with Keystone) has been fixed,
we finally can switch to SQLAlchemy 0.9. It is important we
do the switch to SQLAlchemy 0.9.x ASAP, because that is what
distributions (eg: at least Debian) are using. This also
ensure we avoid any future mistakes if we do the gating with
SQLAlchemy 0.9.

This patch sets the cap from <=0.8.99 to <=0.9.99.

Change-Id: I9d2a9e0526359fa1e97df250a63f71496d47367a
Merge "Adding support for Django 1.6"