Switch to side-by-side view

--- a/requirements-common.txt
+++ b/requirements-common.txt
@@ -67,7 +67,7 @@
 # testing & development
 datadiff==1.1.5
 ipython==0.11
-mock==0.8.0
+mock==1.0.1
 nose==1.1.2
 pyflakes==0.5.0
 WebTest==1.4.0