Add tests for account serializer

Fix bugs with account scope de/serializing
Fix bugs with domain serializer tests
Fix bugs with database account tests

tests/test_serializers_account.py

@@ -0,0 +1,13 @@
+# pylint: disable=unused-argument,redefined-outer-name,unused-import
+from fixtures import demo_database
+
+from keyosk import database
+from keyosk import serializers
+
+
+def test_compatibility(demo_database):
+    serializer = serializers.AccountSerializer()
+
+    for domain in database.KeyoskAccount.select():
+        dumped = serializer.dump(domain)
+        assert domain == serializer.load(dumped)