work around local django.utils package

ox/django/utils.py

@@ -1,6 +1,7 @@
 from django.http import HttpResponse,Http404
 from django.core.servers.basehttp import FileWrapper
 from django.conf import settings
+from django.utils.datetime_safe import datetime
 
 import mimetypes
 import os

ox/utils.py

@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 # vi:si:et:sw=4:sts=4:ts=4
 try:
-    from django.utils.datetime_safe import datetime
+    from django.utils import datetime
 except ImportError:
     from datetime import datetime