Webtest

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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

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- Bugfix: Preserve submit order for radio inputs.

- Fixed 186: avoid UnicodeDecodeError in linter with py2 when a header contain
non ascii chars

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- Fixed 185: Fix strict cookie policy

- Fixed 146: Improve fields value checking when enctype is multipart

- Fixed 119: Assertion error should be raised when you have non-string
response header

- Bugfix: Allow to set an int value to form fields when enctype is multipart

- Added py36 to tox.ini / .travis.yaml

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- Bugfix: Allow to use set_cookie when HTTP_HOST is set

- Fix 177: resp.json now always decode body as utf8

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- Added JWT auth support

- Always show response body when response status is invalid