can extract its name/version/pythonversion/platform if built from a .egg
filename.  Later, distributions will be able to add themselves to sys.path
and request that their dependencies be added as well.  Also, added some
real-life version test cases supplied by jemfinch.

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distutils' StrictVersion, with the flexibility of LooseVersion.  It also
deals heuristically with common concepts like alpha/beta/candidate/rc
and pre/preview, as well as '-' and 'pl' branching schemes.

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distname.egg-info directory instead of EGG-INFO.in; this will be used later
to support development of egg-distributed packages that an application
under development expects to 'require()'.  (Thanks to Fred Drake for
pointing out this use case, and Bob Ippolito for helping me figure out how
to support it, although the runtime support doesn't actually exist yet.)

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Obvious Way to test setuptools is to run 'setup.py test', because that also
provides an integration test for the 'test' command.

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A few more PEP 8 formatting fixes for pkg_resources

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basic support for non-egg resources.  Still a lot to do, but this version
is capable of not only extracting and running C extensions, it can even
find its own runtime (pkg_resources) if it's included in the egg.

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can be extracted from the egg.

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be overridden with a command-line option).

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http://peak.telecommunity.com/DevCenter/PythonEggs for details).  This
version only supports pure libraries and does not support user-defined
metadata.  But it's sufficient to make .egg files that can be placed on
PYTHONPATH and used.

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Python 2.4; this was broken by my earlier change to avoid stomping on
Python 2.4's build_py command

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In this case, setuptools need not override the build_py command.

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style guidelines in PEP 8

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- use whitespace according to the Python style guide

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Warn user if unsupported options are supplied, and cancel unless
'depends -i' (aka '--ignore-extra-args') was used.

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all requirements aren't met.  (Also, check planned install location for
the dependencies, as well as checking sys.path.)  Also:

* Allow 'Feature()' objects to include 'Require()' objects, so that
  dependencies can be optional

* 'Require()' objects can set a homepage, whose URL will be displayed by
  the 'depends' command if the dependency needs to be installed.

* Misc. fixes/refactoring of version validation to properly handle
  "unknown" versions, and to decouple version fetching from version
  checking.

* Updated TODO to remove various completed items.

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