Deform

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- Added ability to pass a translator function to `deform.renderer.configure_zpt_renderer`

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- Added accordions to MappingWidget:
https://deformdemo.pylonsproject.org/mapping_accordion/

- Added CSS class ``deform-form-buttons`` to style form button group:
https://github.com/Pylons/deform/pull/308

- Add more options to ``TextAreaCSVWidget``:
https://github.com/Pylons/deform/pull/309

- Always render an item with a default CSS class:
https://github.com/Pylons/deform/pull/306

- Updated pickdate.js library used for the date picker:
https://github.com/Pylons/deform/pull/248

- Widget Selenium test suite runs both under Python 2 and 3.
Lots of Selenium testing headache fixed with some implicit wait support.

.. note::

Currently Python 3 file upload widget may have compatibility issues.
Please see ``deformdemo/test.py`` for details.

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- Fix regression of ``<select>`` widget default values not honoured

- Updated Select2 widget JavaScript

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- Drop support for Python 2.6.

- Documentation reorganization and clean up to conform with Pylons Project
projects.

- Fix select and select2 widget templates failing on Python 3.x

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- Release polish

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- Update demos and add standalone mini example