Support for django csrf token

    Now an $http call through horizon will automatically be provided
with the csrf token needed by django.

Change-Id: I50bb7180e8f4e515365deaef24891c11cb1a84e0
Implements: blueprint horizon-angular
Co-Authored-By: miziel-r <robert.mizielski@cloudwatt.com>
Merge "Support for django csrf token"