Webtest

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* Don't submit unnamed form fields.

* Checkboxes with no explicit ``value`` send ``on`` (previously they
sent ``checked``, which isn't what browsers send).

* Support for ``<select multiple>`` fields (from Matthew Desmarais)

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* Fix the ``TestApp`` validator's InputWrapper lacking support for
readline with an argument as needed by the cgi module.

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* Keep URLs in-tact in cases such as
``app.get('http://www.python.org')`` (so HTTP_HOST=www.python.org,
etc).

* Fix ``lxml.html`` import, so lxml 2.0 users can get HTML lxml
objects from ``resp.lxml``

* Treat ``<input type="image">`` like a submit button.

* Use ``BaseCookie`` instead of ``SimpleCookie`` for storing cookies
(avoids quoting cookie values).

* Accept any ``params`` argument that has an ``items`` method (like
MultiDict)

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Initial release