Removes unused import and cleans whitespace in mavg.
Removes unused import and cleans whitespace in mavg.

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