Per gerrit:127467 <https://gerrit.wikimedia.org/r/127467/> and bug
55882#c5 <https://bugzilla.wikimedia.org/show_bug.cgi?id=55882#c5>, we
should add
https://pypi.python.org/pypi/ordereddict as a requirement for
installing/using pywikibot.
Any volunteers for a patch?