Setuptools

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* Update dependency on certify.
* BB Pull Request 160: Improve detection of gui script in
``easy_install._adjust_header``.
* Made ``test.test_args`` a non-data property; alternate fix
for the issue reported in BB Pull Request 155.
* Issue 453: In ``ez_setup`` bootstrap module, unload all
``pkg_resources`` modules following download.
* BB Pull Request 158: Honor PEP-488 when excluding
files for namespace packages.
* Issue 419 and BB Pull Request 144: Add experimental support for
reading the version info from distutils-installed metadata rather
than using the version in the filename.

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* Issue 464: Correct regression in invocation of superclass on old-style
class on Python 2.

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* Issue 439: When installing entry_point scripts under development,
omit the version number of the package, allowing any version of the
package to be used.

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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.