Creating bare bones python xpm program

The idea is to use this version to prototype the idea of XPM and bootstrap
an empty environment to compile the real xpm.
Moved python code into module

Want to keep the python code properly organized, so I am placing it in a
module.  Also created a basic shell script to forward calls into it.
Adding license and readme

Don't want the licensing to be ambiguous, and we want to look pretty on
github.