Add assert_in method to nose for Python 2.6

IPython/testing/iptest.py

@@ -40,6 +40,11 @@ import warnings
 # it for actual use.  This should get into nose upstream, but its release cycle
 # is slow and we need it for our parametric tests to work correctly.
 from IPython.testing import nosepatch
+
+# Monkeypatch extra assert methods into nose.tools if they're not already there.
+# This can be dropped once we no longer test on Python 2.6
+from IPython.testing import nose_assert_methods
+
 # Now, proceed to import nose itself
 import nose.plugins.builtin
 from nose.plugins.xunit import Xunit