* By providing a view extension for secondary devices we can use that in
a view mapping to power our devices view controller, and avoid any race
conditions with uncommitted transactions.
* Fix crash when you're not in your own contacts
* New device appears on top
* Don't show "edit" button unless there are devices, or rather, the helpers to do so.
* Fix glitchy refresh
Saving unchanged records was causing the tableview to redraw, which was
mostly invisible, except that if the refresh indicator were running, it
would twitch.
// FREEBIE
