util.stanza: Fixed some more nil global accesses.

util.stanza: Fixed a nil global access.

Merge 0.7->trunk

Merge 0.7/waqas->0.7/MattJ

net.server_event: Fixed spelling fail.

Merge 0.6->0.7

xmppserver_listener: Compatibility fix for older Prosodies with the s2s xmlns bug

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