Make katz_centrality compatible with IronPython
Make katz_centrality compatible with IronPython

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