* updated example of mindmap.

 * fixed an error when add node to the root.

 * updated document.

 * added hotkey to mindmap.

 * added pos option to droppable event.

 * select a node when drag it.

 * make node sortable.

 * ajusted style and changed css names of mindmap.

 * added node id to the mindmap node element.

 * updated example of mindmap.

 * ajusted themes of zentao.

 * updated lightbox.

 * rebuilt zui.