Lock session when device is out of range

Lewis brought up the idea of locking the session when a bluetooth device disconnects. This would mean that for example walking away from the computer should lock the screen.

I think that we would need to do some kind of roundtripping and not just watch for a disconnect to make sure we're getting a good idea of proximity.

Launchpad Details: [#LP1593546](https://bugs.launchpad.net/bugs/1593546) Daniel Fore - 2016-06-17 04:18:35 +0000

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