* adjust code.
 * adjust code.
 * add treeview.js for category.
 * adjust create function for adding order for article of book.
 * adjust update function for adjust order when edit article.
 * add updateOrder function.
 * adjust code.
 * adjust admin function for show articles of book.
 * show articles according to their order when type is book.
Merge branch 'master' of github.com:xirang/chanzhieps

Conflicts:
	system/module/article/model.php