Removes expiration from orders.
Removes expiration from orders.

Expiration is something that way may want to have in the future,
but this current is implementation is dropping orders that
aren't meant to be expired. So removing expiration, so that all
expected orders are executed.

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