Pyquery

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- Remove some unmaintained modules: ``pyquery.ajax`` and ``pyquery.rules``

- Code cleanup. No longer use ugly hacks required by python2.6/python3.2.

- Run tests with python3.6 on CI

- Add a ``method`` argument to ``.outer_html()``

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- ``PyQuery('<input value="">').val()`` is ``''``
- ``PyQuery('<input>').val()`` is ``''``

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- ``.attr('value', '')`` no longer removes the ``value`` attribute

- ``<input type="checkbox">`` without ``value="..."`` have a ``.val()`` of
``'on'``

- ``<input type="radio">`` without ``value="..."`` have a ``.val()`` of
``'on'``

- ``<select>`` without ``<option selected>`` have the value of their first
``<option>`` (or ``None`` if there are no options)

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- .val() should never raise

- drop py26 support

- improve .extend() by returning self

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- fix val() for <textarea> and <select>, to match jQuery behavior

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- Note explicit support for Python 3.5