refactor urls for django 1.6

Author: matclayton

experiments/nexus_modules.py

@@ -1,4 +1,7 @@
-from django.conf.urls.defaults import patterns, url
+try:
+    from django.conf.urls import patterns, url
+except ImportError:  # django < 1.4
+    from django.conf.urls.defaults import patterns, url
 
 from functools import wraps
 

experiments/urls.py

@@ -1,4 +1,7 @@
-from django.conf.urls.defaults import *
+try:
+    from django.conf.urls import patterns, url
+except ImportError:  # django < 1.4
+    from django.conf.urls.defaults import patterns, url
 
 urlpatterns = patterns('experiments.views',
     url(r'^goal/(?P<goal_name>[^/]+)/(?P<cache_buster>[^/]+)?$', 'record_experiment_goal', name="experiment_goal"),