Setuptools

====

* Added a new entry script ``setuptools.launch``,
implementing the shim found in
``pip.util.setuptools_build``. Use this command to launch
distutils-only packages under setuptools in the same way that
pip does, causing the setuptools monkeypatching of distutils
to be invoked prior to invoking a script. Useful for debugging
or otherwise installing a distutils-only package under
setuptools when pip isn't available or otherwise does not
expose the desired functionality. For example::

$ python -m setuptools.launch setup.py develop

* Issue 488: Fix dual manifestation of Extension class in
extension packages installed as dependencies when Cython
is present.

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* Issue 486: Correct TypeError when getfilesystemencoding
returns None.
* Issue 139: Clarified the license as MIT.
* BB Pull Request 169: Removed special handling of command
spec in scripts for Jython.

======

* Issue 487: Use direct invocation of ``importlib.machinery``
in ``pkg_resources`` to avoid missing detection on relevant
platforms.

====

* Issue 341: Correct error in path handling of package data
files in ``build_py`` command when package is empty.
* Distribute 323, Issue 141, Issue 207, and
BB Pull Request 167: Another implementation of
``pkg_resources.WorkingSet`` and ``pkg_resources.Distribution``
that supports replacing an extant package with a new one,
allowing for setup_requires dependencies to supersede installed
packages for the session.

====

* Issue 229: Implement new technique for readily incorporating
dependencies conditionally from vendored copies or primary
locations. Adds a new dependency on six.

====

* BB Pull Request 163: Add get_command_list method to Distribution.
* BB Pull Request 162: Add missing whitespace to multiline string
literals.