Since we have a destroyFeatures command, use it. Patch from fredj, closes

#703.


git-svn-id: http://svn.openlayers.org/trunk/openlayers@3151 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/Vector.js

@@ -97,8 +97,7 @@ OpenLayers.Layer.Vector.prototype =
     destroy: function() {
         OpenLayers.Layer.prototype.destroy.apply(this, arguments);  
 
-        // HACK HACK -- I believe we should be iterating and 
-        //              calling feature[i].destroy() here. 
+        this.destroyFeatures();
         this.features = null;
         this.selectedFeatures = null;
         if (this.renderer) {