Switch to side-by-side view

--- a/requirements-common.txt
+++ b/requirements-common.txt
@@ -8,6 +8,7 @@
 carrot==0.10.3
 celery==1.0.2
 chardet==1.0.1
+datadiff==1.1.2
 decorator==3.1.2
 Django==1.1.1
 django-picklefield==0.1.4