ipython/ipython — pull request #1600 by takluyver (2012-04-15 11:11:24+00:00)
Title: Specify encoding for io.open in notebook_reformat tests

This should fix the OS X test failure seen here:

https://jenkins.shiningpanda.com/ipython/job/ipython-mac/76/testReport/junit/IPython.core.tests/test_magic/test_notebook_reformat_json/