Attempts at fancy version number handling in setup.py caused more
problems than they were worth, including Travis CI build failures.
The setup.cfg key for universal binary wheel generation apparently
changed at some point, so that was updated as well.
Including a binary wheel when uploading Pelican to PyPI will speed up
installation for the Pelican community. This change ensures that the
Pelican wheel is compatible with all supported Python versions. For more
information, see: https://pypi.python.org/pypi/wheel