Small change to setup.py so that we can run running test
running egg_info
writing requirements to python_periods.egg-info/requires.txt
writing python_periods.egg-info/PKG-INFO
writing top-level names to python_periods.egg-info/top_level.txt
writing dependency_links to python_periods.egg-info/dependency_links.txt
reading manifest file 'python_periods.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'python_periods.egg-info/SOURCES.txt'
running build_ext, everything else is perfect here