fixed import unittest for python 2.6

Author: Sinkler

tests/urls.py

@@ -1,8 +1,13 @@
+import sys
 import uuid
-import unittest
 
 from django.conf.urls import include
 
+if sys.version_info >= (2, 7):
+    import unittest
+else:
+    from django.utils import unittest
+
 from macrosurl import MacroUrlPattern, url