Setuptools

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* Merged Setuptools and Distribute. See docs/merge.txt for details.

Added several features that were slated for setuptools 0.6c12:

* Index URL now defaults to HTTPS.
* Added experimental environment marker support. Now clients may designate a
PEP-426 environment marker for "extra" dependencies. Setuptools uses this
feature in ``setup.py`` for optional SSL and certificate validation support
on older platforms. Based on Distutils-SIG discussions, the syntax is
somewhat tentative. There should probably be a PEP with a firmer spec before
the feature should be considered suitable for use.
* Added support for SSL certificate validation when installing packages from
an HTTPS service.

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* Issue 3: Fixed NameError in SSL support.

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* Move warning check in ``get_cache_path`` to follow the directory creation
to avoid errors when the cache path does not yet exist. Fixes the error
reported in Distribute 375.

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* Correct AttributeError in ``ResourceManager.get_cache_path`` introduced in
0.6.46 (redo).

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* Correct AttributeError in ``ResourceManager.get_cache_path`` introduced in
0.6.46.

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* Distribute 375: Issue a warning if the PYTHON_EGG_CACHE or otherwise
customized egg cache location specifies a directory that's group- or
world-writable.