Updates order api to use Order#item_total instead of #total
Updates order api to use Order#item_total instead of #total

DekaFugihara/spree_chimpy,wuboy0307/solidus_chimpy,firmanm/spree_chimpy,asketsthlm/spree_chimpy,JuandGirald/spree_chimpy,DynamoMTL/spree_chimpy,DekaFugihara/spree_chimpy,firmanm/spree_chimpy,andreteves/spree_chimpy,WalkerAndCoBrandsInc/spree_chimpy,WalkerAndCoBrandsInc/spree_chimpy,andreteves/spree_chimpy,WalkerAndCoBrandsInc/spree_chimpy,JuandGirald/spree_chimpy,DynamoMTL/spree_chimpy,wuboy0307/spree_chimpy,DynamoMTL/spree_chimpy,andreteves/spree_chimpy,asketsthlm/spree_chimpy,asketsthlm/spree_chimpy,wuboy0307/solidus_chimpy,JuandGirald/spree_chimpy,DekaFugihara/spree_chimpy,wuboy0307/spree_chimpy,wuboy0307/spree_chimpy,firmanm/spree_chimpy,wuboy0307/solidus_chimpy