Report github not drupal

### Acceptance test:

- [ ] Install 7.x-1.x or 7.x-1.5
- [ ] Go to ``/admin/reports/status`` profile should read: ``DKAN (dkan-)``
- [ ] Go to ``/admin/reports/updates/update`` DKAN version should not be correct and links should point to drupal.org for download and updates

- [ ] Pull this branch
- [ ] Go to ``/admin/reports/status`` profile should read: ``DKAN (dkan-7.x-1.x)``
- [ ] Go to ``/admin/reports/updates/update`` DKAN version should be correct and links should point to github for download and updates