mod_net_proxy: Use safer util.format for generating description string (thanks tom) It appears that server_event may emit port numbers (src_port() in this case) as strings, rather than integers. This causes string.format() to throw an error. Prosody's util.format is a more forgiving formatter and won't throw an error. The server_event behaviour may be best fixed for the sake of consistency, though.

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summary: Lets users create and join roster groups
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Introduction
============

This module lets you join groups using an ad-hoc command. When a user
joins a group, everyone in the group is added to their roster, and they
are added to the rosters of existing members.

TODO
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-   Leaving groups
-   Add a roster group/tag when adding roster items (tricky with current
    rostermanager API)