ENH: Raise on attempt to set a lazyval.
ENH: Raise on attempt to set a lazyval.

grundgruen/zipline,quantopian/zipline,alphaBenj/zipline,enigmampc/catalyst,magne-max/zipline-ja,dmitriz/zipline,jimgoo/zipline-fork,magne-max/zipline-ja,umuzungu/zipline,florentchandelier/zipline,wilsonkichoi/zipline,florentchandelier/zipline,nborggren/zipline,wilsonkichoi/zipline,quantopian/zipline,humdings/zipline,Scapogo/zipline,bartosh/zipline,humdings/zipline,enigmampc/catalyst,Scapogo/zipline,bartosh/zipline,grundgruen/zipline,dmitriz/zipline,umuzungu/zipline,nborggren/zipline,jimgoo/zipline-fork,alphaBenj/zipline