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. committer: Mikael Hallendal <micke@imendio.com>

Colin Walters
Frederic Crozat
Josh Beam
Martyn Russell
Richard Hult
Ross Burton
Sjoerd Simons
Tim Robbins
Tollef Fog Heen