------------------
- pinning version 'WebTest <= 1.3.4', because of some incompatibility and
test failures
- Make zope.testbrowser installable via pip
(https://github.com/zopefoundation/zope.testbrowser/issues/6).
- When ``Browser.handleErrors`` is False, also add ``x-wsgiorg.throw_errors``
to the environment. http://wsgi.org/wsgi/Specifications/throw_errors
- Prevent WebTest from always sending ``paste.throw_errors=True`` in the
environment by setting it to ``None`` when ``Browser.handleErrors`` is
``True``. This makes it easier to test error pages.
- Make Browser.submit() handle ``raiseHttpErrors``
(https://github.com/zopefoundation/zope.testbrowser/pull/4).
- More friendly error messages from getControl() et al:
- when you specify an index that is out of bounds, show the available
choices
- when you fail to find anything, show all the available items