[issue13585] Add contextlib.CleanupManager

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

And the backport: http://contextlib2.readthedocs.org/

I haven't tested on anything other than 2.7 as yet - I have an account request in train with the Shining Panda folks, so I'll set up multi-version CI for this project (along with a couple of others) once that goes through.

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