Flask-mde

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* Replaced `HTMLString` with `markupsafe.Markup` for `MdeField`. `Github Issue 7 - Button Bar Not Displaying <https://github.com/jmcmanus/pagedown-extra>`_.

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* Added support for `pagedown-extra <https://github.com/jmcmanus/pagedown-extra>`_.

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* Fixed `application factory usage issue. <https://github.com/bittobennichan/Flask-MDE/issues/2>`_

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* ``make-pretty`` was not pretty printing ``<pre>`` tags. Fixed.

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* ``make-pretty`` css class added to make the output HTML pretty.

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* This is the Public API.