Ensure the keys for node attributes and edge attributes are strings (not unicode). Fixes #473
Ensure the keys for node attributes and edge attributes are strings (not unicode).
Fixes #473

chrisnatali/networkx,jakevdp/networkx,beni55/networkx,sharifulgeo/networkx,nathania/networkx,chrisnatali/networkx,kai5263499/networkx,farhaanbukhsh/networkx,ionanrozenfeld/networkx,kernc/networkx,bzero/networkx,wasade/networkx,harlowja/networkx,ghdk/networkx,kai5263499/networkx,jni/networkx,JamesClough/networkx,OrkoHunter/networkx,SanketDG/networkx,farhaanbukhsh/networkx,RMKD/networkx,ltiao/networkx,chrisnatali/networkx,andnovar/networkx,sharifulgeo/networkx,cmtm/networkx,dmoliveira/networkx,ionanrozenfeld/networkx,jakevdp/networkx,debsankha/networkx,bzero/networkx,dhimmel/networkx,dmoliveira/networkx,debsankha/networkx,farhaanbukhsh/networkx,debsankha/networkx,goulu/networkx,aureooms/networkx,RMKD/networkx,jfinkels/networkx,nathania/networkx,Sixshaman/networkx,aureooms/networkx,dmoliveira/networkx,kernc/networkx,dhimmel/networkx,harlowja/networkx,blublud/networkx,tmilicic/networkx,ghdk/networkx,nathania/networkx,kai5263499/networkx,jakevdp/networkx,blublud/networkx,kernc/networkx,bzero/networkx,RMKD/networkx,ghdk/networkx,jtorrents/networkx,yashu-seth/networkx,sharifulgeo/networkx,aureooms/networkx,harlowja/networkx,jni/networkx,ionanrozenfeld/networkx,jtorrents/networkx,NvanAdrichem/networkx,jni/networkx,dhimmel/networkx,jcurbelo/networkx,michaelpacer/networkx,blublud/networkx