When a collection is fetched, forward any collectionEvents from it to

the change:$key handler on it's container.

@@ -37,7 +37,19 @@ define(function(require) {
                 } else {
                     return;
                 }
-                return obj.get(keypath);
+                var value = obj.get(keypath);
+                if (value instanceof Collection) {
+                    var listener = function() {
+                        var currentValue = obj.get(keypath);
+                        if (value !== currentValue) {
+                            obj.stopListening(value, collectionEvents, listener);
+                            return;
+                        }
+                        obj.trigger('change:' + keypath, obj, currentValue);
+                    };
+                    obj.listenTo(value, collectionEvents, listener);
+                }
+                return value;
             },
             set: function set(obj, keypath, value) {
                 if (obj instanceof Model) {