Move AUTH code into model of otpauth

To prevent the following exception:

  File "/home/nico/vcs/ungleich-otp/venv/lib/python3.5/site-packages/django/db/models/base.py", line 87, in __new__
    app_config = apps.get_containing_app_config(module)
  File "/home/nico/vcs/ungleich-otp/venv/lib/python3.5/site-packages/django/apps/registry.py", line 249, in get_containing_app_config
    self.check_apps_ready()
  File "/home/nico/vcs/ungleich-otp/venv/lib/python3.5/site-packages/django/apps/registry.py", line 132, in check_apps_ready
    raise AppRegistryNotReady("Apps aren't loaded yet.")
django.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet.
(venv) [12:41] line:ungleichotp%

ungleichotp/otpauth/models.py

@@ -26,3 +26,21 @@ class OTPSeed(AbstractUser):
 #     @classmethod
 #     def has_usable_password(cls):
 #         pass
+
+
+from rest_framework import exceptions
+from rest_framework import authentication
+from otpauth.models import OTPSeed
+from otpauth.serializer import TokenSerializer
+
+class OTPAuthentication(authentication.BaseAuthentication):
+    def authenticate(self, request):
+        serializer = TokenSerializer(data=request.data)
+
+        if serializer.is_valid():
+            print("trying to save... {}".format(serializer))
+            user = serializer.save()
+        else:
+            raise exceptions.AuthenticationFailed()
+
+        return (user, None)

ungleichotp/ungleichotp/settings.py

@@ -102,26 +102,9 @@ AUTH_PASSWORD_VALIDATORS = [
 ]
 
 
-from rest_framework import exceptions
-from rest_framework import authentication
-from otpauth.models import OTPSeed
-from otpauth.serializer import TokenSerializer
-
-class OTPAuthentication(authentication.BaseAuthentication):
-    def authenticate(self, request):
-        serializer = TokenSerializer(data=request.data)
-
-        if serializer.is_valid():
-            print("trying to save... {}".format(serializer))
-            user = serializer.save()
-        else:
-            raise exceptions.AuthenticationFailed()
-
-        return (user, None)
-
 REST_FRAMEWORK = {
     'DEFAULT_AUTHENTICATION_CLASSES': (
-        'OTPAuthentication'
+        'otpauth.models.OTPAuthentication'
     )
 }