allow passing of data type from data source
allow passing of data type from data source

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