remove add_edges
remove add_edges

Some reasons for removing:

 - I think there could be confusion between add_edge and add_edges
   if we keep it.

 - >>> for v in nodelist:
           G.add_edge(u,v)
   is pretty simple to write

Some reasons against:

 - G.add_edges_from(zip([u]*len(nodelist),nodelist))
   is not that simple to write

--HG--
extra : convert_revision : svn%3A3ed01bd8-26fb-0310-9e4c-ca1a4053419f/networkx/trunk%40445

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