Update Py3 compat

cof/settings_dev.py

@@ -1,5 +1,4 @@
-# -*-coding:utf-8 -*
-
+# -*- coding: utf-8 -*-
 """
 Django settings for cof project.
 
@@ -10,6 +9,10 @@ For the full list of settings and their values, see
 https://docs.djangoproject.com/en/1.8/ref/settings/
 """
 
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
 # Build paths inside the project like this: os.path.join(BASE_DIR, ...)
 import os