Merge branch 'master' of https://git.oschina.net/karson/fastadmin

@@ -90,6 +90,7 @@ class Admin extends Backend
             {
                 $params['salt'] = Random::alnum();
                 $params['password'] = md5(md5($params['password']) . $params['salt']);
+                $params['avatar'] = '/assets/img/avatar.png'; //设置新管理员默认头像。
 
                 $admin = $this->model->create($params);
                 $group = $this->request->post("group/a");