Allow replies to non-iq stanzas. [#22] This changes so that any stanza type will check if there is a reply handler waiting for the incoming ID. When implementing for example XEP-0184 (Message Receipts) there will be returned message stanzas that needs to be given to a reply handler. [#22 tagged:committed responsible:Hallski milestone:none state:resolved] committer: Mikael Hallendal <micke@imendio.com>

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