Remove mml uri option as it was deprecated in tilelive-mapnik 0.5.0
Remove mml uri option as it was deprecated in tilelive-mapnik 0.5.0

manueltimita/Windshaft,wsw0108/Windshaft,HydroLogic/Windshaft,CartoDB/Windshaft,wsw0108/Windshaft,CartoDB/Windshaft,CartoDB/Windshaft,manueltimita/Windshaft,HydroLogic/Windshaft,wsw0108/Windshaft,manueltimita/Windshaft,HydroLogic/Windshaft