fix layout bug in plot_lc()
fix layout bug in plot_lc()

sncosmo/sncosmo,dannygoldstein/sncosmo,sncosmo/sncosmo,kbarbary/sncosmo,kbarbary/sncosmo,dannygoldstein/sncosmo,kbarbary/sncosmo,dannygoldstein/sncosmo,sncosmo/sncosmo