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

.coveragerc

@@ -1,20 +1,7 @@
 [run]
 branch = True
 source =
-    alliance_auth
-    authentication
-    corputils
-    eveonline
-    fleetactivitytracking
-    fleetup
-    groupmanagement
-    hrapplications
-    notifications
-    optimer
-    permissions_tool
-    services
-    srp
-    timerboard
+    allianceauth
 
 omit =
     */migrations/*