Xlsxwriter

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* Fix for unicode type error in Python 3. :issue:`554`.

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* Added some performance improvements. :pull:`551`.

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* Added example of how to subclass the Workbook and Worksheet objects. See
:ref:`ex_inheritance1` and :ref:`ex_inheritance2`.

* Added support for WMF and EMF image formats to the Worksheet
:func:`add_image` method.

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* Set the xlsx internal file member datetimes to 1980-01-01 00:00:00 like
Excel so that apps can produce a consistent binary file once the workbook
:func:`set_properties` ``created`` date is set. :pull:`495`.

* Fix for jpeg images that reported unknown height/width due to unusual SOF
markers. :issue:`506`.

* Added support for blanks in list autofilter. :issue:`505`.

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* Added Excel 2010 data bar features such as solid fills and control over the
display of negative values. See :ref:`working_with_conditional_formats` and
:ref:`ex_cond_format`. :feature:`502`.

* Fixed :func:`set_column` parameter names to match docs and other methods.
Note, this is a backward incompatible change. :issue:`504`.

* Fixed missing plotarea formatting in pie/doughnut charts.

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* Fix for cases where the hyperlink style added in the previous release didn't
work. :feature:`455`.