BUG: added mpirun to coverage call in travis
BUG: added mpirun to coverage call in travis

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