Webtest

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* added ``post_json``, ``put_json``, ``delete_json``

* fix `25 <https://bitbucket.org/ianb/webtest/issues/25>`_ params dictionary of
webtest.AppTest.post() does not support unicode values

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* improve showbrowser. fixed `23 <https://bitbucket.org/ianb/webtest/issues/23>`_

* print_stderr fail with unicode string on python2

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* Added .option() `20 <https://bitbucket.org/ianb/webtest/issues/20>`_

* Fix 21

* Full python3 compat

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* Moved TestApp to app.py

* Added selenium testing framework. See :mod:`~webtest.sel` module.

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* Accept lists for ``app.post(url, params=[...])``

* Allow to use url that starts with the SCRIPT_NAME found in extra_environ

* Fix `16 <https://bitbucket.org/ianb/webtest/issues/16>`_ Default
content-type is now correctly set to `application/octet-stream`

* Fix `14 and 18 <https://bitbucket.org/ianb/webtest/issues/18>`_ Allow to use
`.delete(params={})`

* Fix `12 <https://bitbucket.org/ianb/webtest/issues/12>`_

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* Fix `10
<https://bitbucket.org/ianb/webtest/issues/10/testapprequest-method-overwrites-specifics-with-testapp-scoped>`_,
now `TestApp.extra_environ` doesn't take precedence over a WSGI
environment passed in through the request.

* Removed stray print