how to setup Horizon to use SSL-offloading proxy
to properly handle page redirects to SSL.
The example is for Django 1.4 only.
As I see at the moment Django 1.3 is
not supported (pip-requires says Django>=1.4),
so no example for Django 1.3 is added.
Fixes bug 999960
Change-Id: I3b885e84ef8332bfd0fe35a2307eb691cf34be03