Cc-xmljson

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- ``xmljson`` command line script converts from XML to JSON (tribals)
- ``invalid_tags='drop'`` in the constructor drops invalid XML tags in ``.etree()`` (Zurga)
- Bugfix: Parker converts `{'x': null}` to `<x></x>` instead of `<x>None</x>` (jorndoe 29)

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- Bugfix and test cases for multiple nested children in Abdera_ convention

Thanks to mukultaneja

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- Add Abdera_ and Cobra_ conventions
- Add ``Parker.data(preserve_root=True)`` option to preserve root element in
Parker convention.

Thanks to dagwieers

.. _Abdera: http://wiki.open311.org/JSON_and_XML_Conversion/#the-abdera-convention
.. _Cobra: http://wiki.open311.org/JSON_and_XML_Conversion/#the-cobra-convention

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- Add ``xml_fromstring=`` and ``xml_tostring=`` parameters to constructor to
customise string conversion from and to XML.

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- Add the Yahoo_ XML to JSON conversion method.

.. _Yahoo: https://developer.yahoo.com/javascript/json.html#xml

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- Fix ``GData.etree()`` conversion of attributes. (They were ignored. They
should be added as-is.)