Enhance rpm

This PR aims to improve the RPM that is generated by the ``python setup.py bdist_rpm`` command.

Until now, only the documentation in source form was packaged. These changesets improve the RPM generator so that the compiled HTML version of the documentation is packaged instead of the docs source. Also, other informative
documents (README, LICENSE, NOTICE, THANKS) have been included.

Thanks in advance for your time reviewing this patch.