Lingua

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- Po->XLS convertor accidentily included obsolete messages.

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- XLS->Po conversion failed for the first language if no comment or
reference columns were generated. Reported by Rocky Feng.

- Properly support Windows in the xls-po convertors: Windows does not
support atomic file renames, so revert to shutils.rename on that
platform. Reported by Rocky Feng.

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- Extend XML extractor to check python expressions in templates. This
fixes `issue 7 <https://github.com/wichert/lingua/pull/7>`_. Thanks to
Nuno Teixeira for the patch.

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- Set 'i18n' attribute as default prefix where there was no prefix found.
This fixes issues `5 <https://github.com/wichert/lingua/issues/5>`_ and
`6 <https://github.com/wichert/lingua/issues/5>`_. Thanks to
Mathieu Le Marec - Pasquet for the patch.

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- Update XML extractor to ignore elements which only contain a Chameleon
expression (``${....}``). These can happen to give the template engine
a hint that it should try to translate the result of an expression. This
fixes `issue 2 <https://github.com/wichert/lingua/issues/2>`_.

* Update XML extractor to not abort when encountering undeclared
namespaces. This fixes `issue 3
<https://github.com/wichert/lingua/issues/3>`_.

* Fix Python extractor to handle strings split over multiple lines
correctly.

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* Fix po-to-xls when including multiple languages in a single xls file.