[Merge] lp:~kai-mast/friends/upstart2 into lp:friends

[Ken VanDine]

Review: Needs Fixing

I don't think we should automatically start the service unconditionally.  For example if there are no accounts configured, it would add startup overhead when the session starts for no benefit.  Maybe use the dconf bridge and start if a key is set to true.  We can default to false, and let users enable it.
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https://code.launchpad.net/~kai-mast/friends/upstart2/+merge/199361
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