ADD mobile update and test connection functions

	新文件:       main/application/controllers/mobile_basic.php
	ADD a update check function

	修改:         main/application/libraries/Basic.php
	ADD three varibales about mobile platform : version, download, app_key

	修改:         mobile_websocket/js/nws_v2_mobile.js
	REPLACE the disconnection pop message to ws.close function