Txhl7

======================

* Abstract message into a separate class that is responsible for building ACK.
This makes txHL7 useable with other HL7 parsing frameworks.
Requires a new ``IHL7Receiver.parseMessage()`` interface method.
* Add message implementation based on python-hl7, using the new ACK functionality in 0.3.1
* Upgrade to latest python-hl7, v0.3.1, for ACK creation

===================

* twistd plugin. Thanks to `Andrew Wason <https://github.com/rectalogic>`_
* Upgrade to latest python-hl7, v0.3.0, for correct MSH indexing

.. warning::

python-hl7 v0.3.0 breaks `backwards compatibility
<http://python-hl7.readthedocs.org/en/latest/changelog.htmlchangelog-0-3-0>`_.

==================

* Convert to unicode. As soon as a message string is assembled, decode into
unicode, using the codec specified by the implementation of
``IHL7Receiver.getCodec()``. When writing an ACK, the message is re-encoded
into that codec.

======================

* ACK^001 for acknowledging messages (adds python-hl7 dependency)
* Add errBack for catching unhandled errors that responds with reject (AR) ACK.

======================

* Initial basic MLLP implementation