[enh] add setup.cfg for wheel

You should put this in your zshrc to do your releases:

    alias release="python setup.py egg_info sdist bdist_wheel bdist_egg upload"

Be sure to have a rescent version of setuptools for the wheels, I use this to upgrade a virtualenv:

    alias upgrade_pip="pip install -U pip && pip install -U setuptools --no-use-wheel && pip install wheel"