BLD: Update to latest tornado release.
BLD: Update to latest tornado release.

Used by IPython notebook, update version from 3.1.1 to 3.2

michaeljohnbennett/zipline,DVegaCapital/zipline,kmather73/zipline,alphaBenj/zipline,dkushner/zipline,michaeljohnbennett/zipline,quantopian/zipline,grundgruen/zipline,DVegaCapital/zipline,zhoulingjun/zipline,bartosh/zipline,erikness/AlephOne,jordancheah/zipline,jimgoo/zipline-fork,euri10/zipline,sketchytechky/zipline,otmaneJai/Zipline,ronalcc/zipline,jimgoo/zipline-fork,enigmampc/catalyst,joequant/zipline,semio/zipline,stkubr/zipline,cmorgan/zipline,florentchandelier/zipline,nborggren/zipline,humdings/zipline,joequant/zipline,aajtodd/zipline,Scapogo/zipline,dhruvparamhans/zipline,dhruvparamhans/zipline,florentchandelier/zipline,aajtodd/zipline,wilsonkichoi/zipline,wilsonkichoi/zipline,iamkingmaker/zipline,enigmampc/catalyst,AlirezaShahabi/zipline,StratsOn/zipline,YuepengGuo/zipline,semio/zipline,alphaBenj/zipline,stkubr/zipline,chrjxj/zipline,nborggren/zipline,morrisonwudi/zipline,morrisonwudi/zipline,otmaneJai/Zipline,cmorgan/zipline,umuzungu/zipline,wubr2000/zipline,bartosh/zipline,wubr2000/zipline,CDSFinance/zipline,keir-rex/zipline,umuzungu/zipline,gwulfs/zipline,MonoCloud/zipline,ChinaQuants/zipline,AlirezaShahabi/zipline,Scapogo/zipline,erikness/AlephOne,gwulfs/zipline,euri10/zipline,kmather73/zipline,jordancheah/zipline,chrjxj/zipline,dmitriz/zipline,magne-max/zipline-ja,CDSFinance/zipline,mattcaldwell/zipline,ronalcc/zipline,sketchytechky/zipline,ChinaQuants/zipline,YuepengGuo/zipline,quantopian/zipline,magne-max/zipline-ja,iamkingmaker/zipline,zhoulingjun/zipline,MonoCloud/zipline,grundgruen/zipline,humdings/zipline,StratsOn/zipline,dmitriz/zipline,dkushner/zipline,mattcaldwell/zipline,keir-rex/zipline