remove doctests.py, since nose will find all automatically
remove doctests.py, since nose will find all automatically

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