updated readme with demos
updated readme with demos

fbonzon/Leaflet.Elevation,kristianj/Leaflet.Elevation,gavioto/Leaflet.Elevation,mikelfo/Leaflet.Graph,gavioto/Leaflet.Elevation,gavioto/Leaflet.Elevation,mikelfo/Leaflet.Graph,MrMufflon/Leaflet.Elevation,MrMufflon/Leaflet.Elevation,fbonzon/Leaflet.Elevation,kristianj/Leaflet.Elevation,MrMufflon/Leaflet.Elevation,fbonzon/Leaflet.Elevation