Add:
	ActiveRecord add join order limti support.
Add:
	add memory benchmark function.
Add:
	application can get sub class name from $this->active_sub
Modified:
	some html code change.
Modified:
	change query method to $this->sql
Modified:
	use $this->active_sub to $data["active_node"]
Modified:
	dispaly username in menubar.
Add:
	add manage login client script.
Remove:
	delete some garbage file.
Modified:
	return true or false when delete session index
Modified:
	do not check user's access permission in __construct(), do it by hand.
Modified:
	change view file format to adaptable to sql result.
Modified:
	Improve the user login logic
Add:
	not implement cookie json library.
Add:
	add function get username and get user id out of controller.
Modified:
	change database access to $this->sql style.
Modified:
	remove the fucking comment block.
Modified:
	change controller to use ActiveRecord result.
Modified:
	Change database name.
Add:
	manage/login css file