Add namespacing method to Fuse

Fuse.addNS = Fuse.prototype.addNS = function(path, parent) {
  parent = parent || this.prototype && this || this.constructor;
  var part, parts = path.split('.'), i = 0;
  while (part = parts[i++]) {
    if (parent[part]) {
      parent = parent[part];
    } else {
      parent = parent[part] = Fuse.Class.create(parent, { });
      parent.Plugin = parent.prototype;
    }
  }
  return parent;
};
 
Fuse.addNS('Dom.NodeList').Plugin = (function() {
  return { /* ... */ };
})();
 
Fuse.Dom.addNs('Form');