[issue16991] Add OrderedDict written in C

[Yury Selivanov]

Yury Selivanov added the comment:

Can we merge this patch before new beta2? https://mail.python.org/pipermail/python-committers/2015-May/003410.html

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16991>
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