Kdesk hook will receive Screen saver running time

 * For screensaver finish hook, the second parameter is the
   time it has been running, in seconds.
Fix for some weird keyboards (bluetooth) which break the inactivity timer

 * The timer is used to decide when the screen saver has to start
Merge pull request #68 from KanoComputing/ssaver-timing

Kdesk hook will receive Screen saver running time