[Distutils] free project idea

[Daniel Holth]

Take this setup.py that implements setup requirements (requirements needed
for setup.py itself to run)
https://bitbucket.org/dholth/setup-requires/src/tip/setup.py

Require your new build system using that mechanism, by mentioning it in
setup.cfg

Then instead of calling setup() from setuptools at the bottom, emulate the
setup.py build system interface documented at
http://pip.readthedocs.org/en/stable/reference/pip_install/#build-system-interface
to
invoke new build system. Check to make sure whether pip accepts .dist-info
when calling the egg_info command.

Then write a command for new build system that adds the shim setup.py to an
sdist.

Now you have a setup.py that can download and install new-build-system and
interoperate with pip, without having to change pip at all.
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