Fix the remaining tests

RIGS/tests/test_models.py

@@ -3,7 +3,8 @@ from reversion import revisions as reversion
 from django.conf import settings
 from django.core.exceptions import ValidationError
 from django.test import TestCase
-from RIGS import models, versioning
+from RIGS import models
+from versioning import versioning
 from datetime import date, timedelta, datetime, time
 from decimal import *
 from PyRIGS.tests.base import create_browser