Webtest

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- python3.8 compat

- Remove use of deprecated splittype and splithost

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- Fix the test ``length == 0`` in ``check_content_type``.

- Treat ``<input type="search">`` like ``<input type="text">``.

- Handle query parameters for the ``head`` method.

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- Fixed 210. Allow to reset select multiple with `field.value = []`

- Support for PYTHONOPTIMIZE=2, fix tests on PYTHONOPTIMIZE=1, 2

- Fixed 196. Fix deprecation warnings for ``collections`` to use
``collections.abc`` for ``Iterable`` on Python 3.

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- remove invalid email from setup.py

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- py33 is no longer supported. It may works but has been removed from tox config

- Fixed 205: Use empty string as default value for submit and button

- tests use pytest

- docs use the standard Pylons template on RTD

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- Add ``Email`` class for input fields with type "email".

- Documentation bearer token and JWT authorization