clear up some naming issues in laplacian:
clear up some naming issues in laplacian:

laplacian=combinatorial_laplacian = D-A

normalized_laplacian=generalized_laplacian

--HG--
extra : convert_revision : svn%3A3ed01bd8-26fb-0310-9e4c-ca1a4053419f/networkx/trunk%40149

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