Lingua

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- Handle calls to the Python extractor with bytes input. This fixes problems with
Lingua plugins build for Lingua < 4.

- Atomically replace the POT file to guarantee no broken POT file will be created.

- Do not replace a POT file if there are no changes (ignoring metadata
changes). This fixes `issue 67
<https://github.com/wichert/lingua/issues/67>`_

-------------------------

- Fix breaking error introduced in 4.8 release.

-----------------------

- The XML extractor correctly handle i18n comments for attributes now.

----------------------

- Make i18n comments in HTML file inheritable. This was already documented, but
did not work.

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- Use unittest.mock on Python 3.3 and later.

- The Python extractor correctly handles the ``--keyword`` parameter now.
`Patch 75 <https://github.com/wichert/lingua/pull/75>`_ from
Omar Kohl, fixing `issue 74 <https://github.com/wichert/lingua/issues/74>`_

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- Fix Python 3 compatibility.