Gocept-selenium

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- Webdriver: ``waitFor`` will now retry the assertion when
``StaleElementReferenceException`` was raised, instead of yielding the error.
(This could happen for assertions like ``waitForAttribute``, which would
retrieve the DOM node and *then* ask for it's attribute. Thus the node can
be changed in-between, which leads to the error.)

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- Improve environment variable handling implementation.

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- Fix handling firefox profile in remote=false mode.

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- Allow launching the browser directly when using Webdriver
(set ``GOCEPT_WEBDRIVER_REMOTE=False`` and the browser name accordingly).

- Add optional ``movement`` parameter to ``dragAndDropToObject`` that moves the
mouse a little before releasing the button, so one gets more realistic
behaviour when needed (Webdriver only, RC does not seem to have this issue).

- Add ``js`` and ``jquery`` locators (Webdriver only).

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- Fixed capitalisation of Selenese's ``chooseOkOnNextConfirmation``.
(Backwards incompatibility should be OK as it can never have worked before,
anyway.)

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- No longer stop whole test run if an exception occures during
``testSetUp`` of ``.seleniumrc.Layer`` (13375)