Minimock

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* python3 (+ tox) support! (Marc Abramowitz)

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* Fix for mocking proxy objects. Worked in 1.2.5 but broken in 1.2.6 by the
change to allow mocking static methods. Reported by Randy Syring.
* bugfix: ``mock_show_attrs`` was immutable after initialization because the
``mock_`` prefix was accidentally left off in ``Mock.__setattr__`` (Yusuke
Muraoka)

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* Allow changing the tracker on a mock object once it's been set (James Brady)
* Support doctest use case (Israel Tsadok)
* Fix issue 1: setting mock_returns_iter on existing Mock object (kenmacd)
* Fix issue 2: static methods become unbound methods after mock + restore

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* Deprecate ``MockTracker``. ``TraceTracker`` should be used instead.

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* Fix show_attrs=True bug (Kendrick Shaw)

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* Explicitly passing ``tracker=None`` to the ``Mock`` constructor now
suppresses tracking. If ``tracker`` is not passed it will still use
``Printer(sys.stdout)`` as before.