ADD series functions to display database & tables & basic database info
	重命名:       application/views/control_center_view.php -> application/views/ControlCenterView.php
	Standardization the spell of class name
	修改:         application/libraries/Database.php
	ADD function to get basic informations

	修改:         application/views/ControlCenterView.php
	FIX the scroll bugs and display databases & tables on the left

	修改:         application/views/login_view.php
	UPDATE
ADD a series of functions to display databases & tables & basic info
	新文件:       application/controllers/ControlCenter.php
	Standardization the spell of class name

	新文件:       application/views/login_view_websoket.php
	BACKUP the login potal through the websocket
        修改:         application/libraries/Database.php
        ADD function to get basic informations

        修改:         application/views/ControlCenterView.php
        FIX the scroll bugs and display databases & tables on the left