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

[Robert Bruce Park]

The proposal to merge lp:~kai-mast/friends/keep-mentions into lp:friends has been updated.

Commit Message changed to:

Purge old messages on a per-stream basis.

For more details, see:
https://code.launchpad.net/~kai-mast/friends/keep-mentions/+merge/204784
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https://code.launchpad.net/~kai-mast/friends/keep-mentions/+merge/204784
Your team Super Friends is requested to review the proposed merge of lp:~kai-mast/friends/keep-mentions into lp:friends.