Removes unused module.
Removes unused module.

Looks like this was used for keeping state in the 0MQ-heavy world.

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