Add top-level setup.py to make pip install git+https work.

[abarnert]

Updated releases to PyPI may never happen, and certainly won't be happening regularly in the near future. So, for people who need appscript, pip install appscript won't work.

At present, to install appscript, you have to do this:

git clone https://github.com/mattneub/appscript.git
pip install ./py-appscript/trunk

Putting a setup.py at the top level means you only need this:

pip install git+https://github.com/mattneub/appscript

It would be also be slightly helpful for those who prefer to use easy_install, or to build and install manually—they'd still need two steps instead of one, but at least they wouldn't have to figure out the CVS structure of the py-appscript subproject. And it might even help whoever maintains the ports for MacPorts and Fink.

But they aren't the main motivation; pip is the way most Mac users get Python packages.