Displays a Bootstrap warning dialog after a set amount of idle time. If user is still inactive, automatically redirects to a timeout URL. Idle time is defined as no mouse, keyboard or touch event activity registered by the browser. As long as the user is active, the keep-alive URL also keeps getting pinged and the session stays alive. Optionally, you can also use this plugin as a simple lock mechanism on its own, if you have no need to keep the server-side session alive.