Plone-app-robotframework

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- With lazy sandbox-server shutdown, let test layers to declare themselves
dirty and force sandbox rebuild when required
[datakurre]

- Fix PloneRobotFixture to know its deployment state and declare itself
dirty when required for lazy sandbox-server shutdown support
[datakurre]

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- Add support for lazy sandbox-server (Zope2Server) shutdown with
``pybot --listener plone.app.framework.server.LazyStop`` or with
Sphinx extension ``plone.app.robotframeworks.server`` to allow
sequential Sphinx documents to share the same server for screenshots
generation
[datakurre]

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- Fix CSRF errors on content creation keywords
[vangheem]

-------------------

- Fix issue where 'use_email_as_login' was not found in registry
[datakurre]
- Fix selenium2library link in documentation
[gotcha]
- Inline sample robot code for mentioned example into docs
[pjoshi]

-------------------

- Update good known versions.
[gotcha]

- "Create content" keyword fix: creation of random images in ATCT did not
work when dexterity was installed.
[gotcha]

------------------

- "Create content" keyword fixes: Fix creation of random images, add image to
News Item if not defined, add file to File if not defined.
[thet]

- Also detect mockup-based modals in the "Click Overlay Link" and
"Click Overlay Button" keywords.
[davisagli]

- Read ``use_email_as_login`` setting from the registry instead of portal
properties (see https://github.com/plone/Products.CMFPlone/issues/216).
[jcerjak]