I managed to import networkx library (version 2.0.dev_20160927182259) into rhino6 and gh earlier today without having numpy and scipy.
I placed the networkx folder into C:\Program Files\Rhino 6\Plug-ins\IronPython\Lib\site-packages\networkxrkx, typed in _EditPythonScript command went to Options, under Tools tab, and added the same path.
Hopefully this works for you and others, and below is the thread I was on (others’ comments may be helpful):