Moved lock-after code from listener-x11 to the manager
Added late locking.

Lock the session when the screen saver disappears. This well reduce the
negative effects of VT switching.
Only draw the redirect message after the lock signal.

This hides the message in the case that the lock window gets raised
above the screensaver. And this hide the message during suspend/resume.
Corrected preview for gtk3
Hide mouse pointer with Gtk3
Merge branch 'late-locking'
Added --lock-on-suspend option
Preparing to release 1.3.0