Setuptools

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* In preparation for dropping support for Python 3.2, a warning is
now logged when pkg_resources is imported on Python 3.2 or earlier
Python 3 versions.
* `Add support for python_platform_implementation environment marker
<https://github.com/pypa/setuptools/commit/94416707fd59a65f4a8f7f70541d6b3fc018b626>`_.
* `Fix dictionary mutation during iteration
<https://github.com/pypa/setuptools/commit/57ebfa41e0f96b97e599ecd931b7ae8a143e096e>`_.

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* Issue 446: Test command now always invokes unittest, even
if no test suite is supplied.

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* Correct another regression in setuptools.findall
where the fix for Python 12885 was lost.

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* Issue 425: Correct regression in setuptools.findall.

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* BB Pull Request 135: Setuptools now allows disabling of
the manipulation of the sys.path
during the processing of the easy-install.pth file. To do so, set
the environment variable ``SETUPTOOLS_SYS_PATH_TECHNIQUE`` to
anything but "rewrite" (consider "raw"). During any install operation
with manipulation disabled, setuptools packages will be appended to
sys.path naturally.

Future versions may change the default behavior to disable
manipulation. If so, the default behavior can be retained by setting
the variable to "rewrite".

* Issue 257: ``easy_install --version`` now shows more detail
about the installation location and Python version.

* Refactor setuptools.findall in preparation for re-submission
back to distutils.

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* Issue 412: More efficient directory search in ``find_packages``.