Back to layer and add zIndex to the container

lib/torque/leaflet/canvas_layer.js

@@ -4,7 +4,7 @@ require('./leaflet_tileloader_mixin');
  * full canvas layer implementation for Leaflet
  */
 
-L.CanvasLayer = L.GridLayer.extend({
+L.CanvasLayer = L.Layer.extend({
 
   includes: [L.Mixin.Events, L.Mixin.TileLoader],
 
@@ -186,6 +186,7 @@ L.CanvasLayer = L.GridLayer.extend({
   },
 
   setZIndex: function(zIndex) {
+    this._container.style.zIndex = zIndex;
     this._canvas.style.zIndex = zIndex;
     if (this.options.zoomAnimation) {
       this._backCanvas.style.zIndex = zIndex;