mod_pep: Implement 'roster' (group) access_model
Allows e.g. restricting your vcard4 to only family or similar.
Notes: This does not include roster groups in the configuration form,
so the client will have to get them from the actual roster.
-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
module:set_global(); -- we're a global module
-- TODO delete this whole concept