Setup distutils

I've implemented a basic package installer for burnman.  The data files now reside in burnman/data.

You can try to install by entering
"sudo python setup.py install"

This should allow you to execute burnman scripts from anywhere.  Scripts run from the burnman root directory should still work, though.  Please let me know if you run into any troubles.  If it works fine on a few machines, we can try registering it with pip.