enable doctests to be run by setup.py
enable doctests to be run by setup.py

dssg/givinggraph,dssg/givinggraph,math4youbyusgroupillinois/givinggraph,erichilarysmithsr/givinggraph,erichilarysmithsr/givinggraph,erichilarysmithsr/givinggraph,math4youbyusgroupillinois/givinggraph,math4youbyusgroupillinois/givinggraph,dssg/givinggraph