call Tile's destroy() after cleaning up our own business

git-svn-id: http://svn.openlayers.org/trunk/openlayers@522 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Tile/Image.js

@@ -27,6 +27,7 @@ OpenLayers.Tile.Image.prototype =
             this.layer.div.removeChild(this.img);
         }
         this.img = null;
+        OpenLayers.Tile.prototype.destroy.apply(this, arguments);
     },
 
     /**

lib/OpenLayers/Tile/WFS.js

@@ -32,7 +32,7 @@ OpenLayers.Tile.WFS.prototype =
         for(var i=0; i < this.features.length; i++) {
             this.features[i].destroy();
         }
-        
+        OpenLayers.Tile.prototype.destroy.apply(this, arguments);
     },
 
     /**