when drawing with pylab set alpha value explicitly for edge collection data
when drawing with pylab set alpha value explicitly for edge collection data

--HG--
extra : convert_revision : svn%3A3ed01bd8-26fb-0310-9e4c-ca1a4053419f/networkx/trunk%40314

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