[Distutils] Progress on the first distribute release

[Hanno Schlichting]

Hi.

Following up on myself :)

We started to work on the documentation, added the basic Sphinx
infrastructure and added a new combined changelog which lists the
changes made in this fork.

Since we have forked the setuptools 0.6 branch, I have carefully
reviewed what changesets we missed from the setuptools trunk. Based on
this review I have merged a couple more bug-fixes and style changes to
our code. There are only a minor number of remaining differences to
the setuptools trunk, which are not appropriate for a maintenance
release. These are tracked at
http://bitbucket.org/tarek/distribute/issue/14.

In addition to the eight issues we have fixed so far, these are the
new additions we applied, solely based on the work from the original
contributers:

* Packages required at build time where not fully present at install
time. This closes http://bitbucket.org/tarek/distribute/issue/12.

* Avoid a call to /usr/bin/sw_vers on OSX and use the official
platform API instead. Based on a patch from ronaldoussoren. This
closes http://bitbucket.org/tarek/distribute/issue/5.

* Fixed a SandboxViolation for mkdir that could occur in certain
cases. This closes http://bitbucket.org/tarek/distribute/issue/13.

Hanno