ENH: save likelihood score even if number of iterations = 0
ENH: save likelihood score even if number of iterations = 0

mnicholl/MOSFiT,villrv/MOSFiT,guillochon/MOSFiT,guillochon/FriendlyFit,bmockler/MOSFiT,mnicholl/MOSFiT,villrv/MOSFiT,guillochon/MOSFiT,mnicholl/MOSFiT,guillochon/MOSFiT,bmockler/MOSFiT