check for example output directory and create if necessary
check for example output directory and create if necessary

--HG--
extra : convert_revision : svn%3A3ed01bd8-26fb-0310-9e4c-ca1a4053419f/networkx/trunk%40988

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