Coilmq

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* Error with one subscriber causes topic messages not to be delivered to
other subscribers (issue 33).
* Fixed error in some circumstances when clearing pending transaction
frames with commit/abort (issue 30).
* Fixed incorrect default address in help (issue 29).

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* Added a new diagnostic thread that will run when --debug option
is passed on the commandline.
* Added method to QueueManager API to support tracking subscriber count.
* Improved unit and functional test coverage of storage engines.
* Fixed bug in engine.commit() and updated tests to catch previous
failure (issue 28).

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* Added support for RECEIPT header and server messages (issue 26).

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* Fixed packaging (MANIFEST.in) to include defaults.cfg and config.cfg-sample
(issue 23).
* Fixed socket recv loop to appropriately handle client DISCONNECT messages
(issue 24).

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* Fixed bug in requeuing of pending frames when client is disconnected
(issue 22).
* Fixed bug in unit test for dbm on windows (issue 21).

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* Added allow_socket_reuse (SO_REUSEADDR) option to SocketServer subclass
to avoid having to wait to restart server after unclean client
disconnect.