Deep cloning. Cloning also clones children. Also added unit test to confirm that it's working as expected.

dist/kinetic-core.js

@@ -3,7 +3,7 @@
  * http://www.kineticjs.com/
  * Copyright 2012, Eric Rowell
  * Licensed under the MIT or GPL Version 2 licenses.
- * Date: Aug 26 2012
+ * Date: Sep 02 2012
  *
  * Copyright (C) 2011 - 2012 by Eric Rowell
  *
@@ -2605,6 +2605,22 @@ Kinetic.Container.prototype = {
 
         return false;
     },
+    /**
+     * clone node
+     * @name clone
+     * @methodOf Kinetic.Node.prototype
+     * @param {Object} attrs override attrs
+     */
+    clone: function(obj) {
+        // call super method
+        var node = Kinetic.Node.prototype.clone.call(this, obj)
+        
+        // perform deep clone on containers
+        for(var key in this.children) {
+            node.add(this.children[key].clone());
+        }
+        return node;
+    },
     /**
      * get shapes that intersect a point
      * @name getIntersections