IvanSanchez/Leaflet.Polyline.SnakeAnim: Animates Leaflet polylines so they creep into full length
var latlngs = [];
for (var i = 0; i < route.length; i++) {
latlngs.push(new L.LatLng(route[i][1], route[i][0]));
}
var line = L.polyline(latlngs, {snakingSpeed: 200});
line.addTo(map).snakeIn();
path.snakeIn();