Gocept-selenium

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- API expansion: ``*keyDown``, ``*keyUp``, ``keyPress``.

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- API expansion: added ``getSelectedLabel``.

- Ignore the code of a server's response when calling `open`. The default
behaviour of SeleniumRC changed between 1.0.1 and 1.0.2 but we want the old
behaviour by default.

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- API expansion: add ``getLocation`` to retrieve currently loaded URL in
browser.

- API expansion: added ``waitForPopUp``, ``selectPopUp``, ``deselectPopUp``
and ``close``.

- API expansion: added ``verifyAlertPresent``, ``verifyAlertNotPresent`` and
``waitForAlertPresent``.

- Usability: raise a better readable exception when an unimplemented selenese
method is called.

- Usability: raise failure exceptions that convey the name of the failed
assertion in spite of some lambdas wrapped around it.

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- Extracted 'host' and 'port' as class attributes of gocept.selenium.ztk.Layer
so subclasses can override them; stopped hardcoding 8087 as the server port.

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- Fix incomplete sdist release on PyPI.

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- Make Zope 2 test server reachable from the outside.
- Implemented getTitle/assertTitle/waitForTitle/etc.