Update setup.py to cythonize in a Git environment
Update setup.py to cythonize in a Git environment

The setup script currently only checks if the Mercurial directory (.hg) is present to determine whether to use the pre-cythonized _NetworKit.cpp. Therefore, the Cython wrapper is never re-built if you checked out NetworKit in Git.
fmaschler/networkit,fmaschler/networkit,fmaschler/networkit,fmaschler/networkit,fmaschler/networkit,fmaschler/networkit