more memory leak handling

Author: allenhwkim

controllers/map-controller.js

@@ -55,6 +55,7 @@
         var objs = obj.map[groupName];
         for (var name in objs) {
           if (objs[name] === obj) {
+            //console.log('Deleting', groupName, obj);
             google.maps.event.clearInstanceListeners(obj);
             delete objs[name];
           }

directives/custom-control.js

@@ -52,6 +52,9 @@
     var position = options.position;
     mapController.map.controls[google.maps.ControlPosition[position]].push(customControlEl);
 
+    element.bind('$destroy', function() {
+      mapController.deleteObject('customControls', customControlEl);
+    });
   };
 
   var customControl =  function(Attr2MapOptions, _$compile_, _NgMap_)  {