Contextlib2

^^^^^^^^^^^^^^^^

* Renamed CleanupManager to ContextStack (hopefully before anyone started
using the module for anything, since I didn't alias the old name at all)

^^^^^^^^^^^^^^^^

* Initial release as a backport module
* Added CleanupManager (based on a `Python feature request`_)
* Added ContextDecorator.refresh_cm() (based on a `Python tracker issue`_)

.. _Python feature request: http://bugs.python.org/issue13585
.. _Python tracker issue: http://bugs.python.org/issue11647