save references to overloaded leaflet methods, and only call them when the tangram layer is active (fixes issue with switching between tangram and non-tangram layers w/leaflet layer control #637)
save references to overloaded leaflet methods, and only call them when the tangram layer is active
(fixes issue with switching between tangram and non-tangram layers w/leaflet layer control #637)

tangrams/tangram,tangrams/tangram