Restructure Alliance Auth package (#867)

* Refactor allianceauth into its own package

* Add setup

* Add missing default_app_config declarations

* Fix timerboard namespacing

* Remove obsolete future imports

* Remove py2 mock support

* Remove six

* Add experimental 3.7 support and multiple Dj versions

* Remove python_2_unicode_compatible

* Add navhelper as local package

* Update requirements

runtests.py

@@ -1,10 +1,9 @@
 #!/usr/bin/env python
-from __future__ import unicode_literals
 import os
 import sys
 
 if __name__ == "__main__":
-    os.environ['DJANGO_SETTINGS_MODULE'] = 'alliance_auth.tests.test_settings'
+    os.environ['DJANGO_SETTINGS_MODULE'] = 'test_allianceauth.settings'
 
     try:
         from django.core.management import execute_from_command_line