Create setup.py

[grahamu]

A nicety for the harried developer. One less file to add manually.

[grahamu]

@paltman here's the simple setup.py if you decide we add that to starter projects.

[jtauber]

I've never needed to add that file to a project. While largely innocuous, it still seems a core change to be making at the 11th hour after ten years of not doing projects that way.

(i.e. I'm not -1, just -0 and think it needs more discussion and not worth holding up a release for)