fix(tests): fix deprecated imports for Django <1.6

This fixes an import that breaks in older versions of Django. It's just
the 'django.conf.urls.defaults' import that was deprecated and removed
in Django 1.6.

Author: zpencerq

tests/urls.py

@@ -1,5 +1,9 @@
-from django.conf.urls import (patterns, url, include,  # noqa
-                              handler500, handler404)
+try:
+    from django.conf.urls import (patterns, include, url,
+                                  handler500, handler404)
+except ImportError:
+    from django.conf.urls.defaults import (patterns, include, url,  # noqa
+                                  handler500, handler404)
 from djcelery.views import apply
 
 # Uncomment the next two lines to enable the admin: