Better handling of edge data in read_pajek().
Better handling of edge data in read_pajek().

Optional edge_attr=True|False to control type of data
returned on edge.

--HG--
extra : convert_revision : svn%3A3ed01bd8-26fb-0310-9e4c-ca1a4053419f/networkx/trunk%401094

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