Affiliation changes

[Steven Lloyd Watkin]

The node server seems to do:

<message xmlns='jabber:client' type='headline' to='ll...@buddycloud.org/laptop' from='channels.buddycloud.org'>
    <event xmlns='http://jabber.org/protocol/pubsub#event'>
        <affiliations node='/user/ll...@buddycloud.org/geo/current'>
            <affiliation jid='lloyd...@buddycloud.org' affiliation='publisher'/>
        </affiliations>
    </event>
</message>

XEP-0060 says (http://xmpp.org/extensions/xep-0060.html#owner-affiliations-notify):

<message from='pubsub.shakespeare.lit' to='polo...@denmark.lit'>
  <pubsub xmlns='http://jabber.org/protocol/pubsub'>
    <affiliations node='princely_musings'>
      <affilation jid='polo...@denmark.lit' affiliation='none'/>
    </affiliations>
  </pubsub>
</message>

Is there a reason we're using event element rather than pubsub?