Gocept.selenium

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- Catch ElementClickInterceptedException when an element is clicked.

- Migrate to Github.

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- Fix `UserWarning` in `selenium >= 3`, that screenshot name should end with
`.png`.

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Backwards incompatible changes
++++++++++++++++++++++++++++++

- Remove support for Selenium 1, in particular ``RCTestCase`` and ``RCLayer``.

- Remove support for Selenium 2.

- Remove support for a remote selenium server. `gocept.selenium` now uses the
local implementation, starting its own browser.

Features
++++++++

- Add support for Python 3.6 and 3.7.

- Selenium updated to version 3.

- Add firefox headless support.

- Add new defaults for gocept.selenium.webdriver.Layer.

- Add experimental support for chromedriver in headless mode only.


Other changes
+++++++++++++

- Remove bootstrap.py, add requirements.txt.

- Fix more deprecation warnings.

- ``selenese_pattern_equals()`` in `wd_selenese.py` now returns a bool.

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- Drop support for Zope 2.

- Depend on ``gocept.httpserverlayer >= 3``.

- Depend on ``plone.testing >= 7.0``.

- Fix deprecation warnings.

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- Fix ``wd_selense.Selenese.selectFrame('index=0')`` to forward the index as
number to the underlying WebDriver so it is actually treated as an index.

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- Support selenium versions >= 2.53.
https://bitbucket.org/gocept/gocept.selenium/issues/12

- Require a selenium version < 3.0 as this version removed the support for
Selenium RC.