added pandas to travis.yml
added pandas to travis.yml

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