bugfix: filtering with guardian's AnonymousUser

Shouldn't need any changes apart from this, as server-manager is already configured to set ANONYMOUS_USER_NAME = None

djangoldp_circle/tests/runner.py

@@ -25,7 +25,9 @@ settings.configure(default_settings=settings_default,
                    },
                    SEND_BACKLINKS=False,
                    JABBER_DEFAULT_HOST=None,
-                   PERMISSIONS_CACHE=False
+                   PERMISSIONS_CACHE=False,
+                   USER_ANONYMOUS_NAME=None,
+                   SERIALIZER_CACHE=False
                    )
 
 django.setup()