First attempt to use autotools with postr.  The python scripts
have not been updated in order to look the proper directories.
So, you can use autogen.sh/configure, make (install, distcheck,
etc.), everything will look fine but postr will not work in the
installed directory :-)

You still can use setup.py or run the uninstalled postr.

Signed-off-by: Germán Póo-Caamaño <gpoo@gnome.org>