UUIDField now stores as a binary by default (#292)

tests/migration/__init__.py

@@ -1,6 +1,7 @@
 from convert_to_new_inheritance_model import *
 from refrencefield_dbref_to_object_id import *
 from turn_off_inheritance import *
+from uuidfield_to_binary import *
 
 if __name__ == '__main__':
     unittest.main()