Plone.app.layout

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New features:

- Do not render social metadata if you are a logged user.
[bsuttor]

- Add method ``is_toolbar_visible`` to context state.
It uses a whitelist and defaults to authenticated users.
Use new method it in toolbar viewlet manager and layout body classes.
[jensens]

Bug fixes:

- fixed css-classes for thumb scales ...
https://github.com/plone/Products.CMFPlone/issues/2077
[fgrcon]

- Deprecating getIcon() in plone_layout
see https://github.com/plone/Products.CMFPlone/issues/1734
[fgrcon]

- Factor toolbar classes out to own method.
Includes minor cleanup.
[jensens]

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Bug fixes:

- Fix tests for social media viewlet.
[hvelarde]

- Fix import location for Products.ATContentTypes.interfaces.
[thet]

- Remove redundant Twitter card tags. If og:title, og:description, og:image and
og:url are defined Twitter will recognise and use those on the card.
See: `Twitter getting started <https://dev.twitter.com/cards/getting-started>`_ section on
Twitter Cards and Open Graph. Fixes `issue 119 <https://github.com/plone/plone.app.layout/issues/119>`_.
[jladage]

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Bug fixes:

- Fix error in viewlet when related dexterity item has been deleted.
[maurits]

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Bug fixes:

- Fix sitemap.xml.gz for plone.app.multilingual (>= 2.x) but breaks it for
LinguaPlone and plone.app.multilingual 1.x
If this is a problem then please see bedbfeb67 on 2.5.x branch for how to
maintain compatibility with these products.
[djowett]

- Include the ``template`` body class also, when a view but no template is passed.
Fixes missing template class with plone.app.blocks based layouts in Mosaic.
[thet]

- prevent extra '' in twitter:site meta tag
[tkimnguyen]

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Bug fixes:

- Removed ZopeTestCase from the tests.
[ivanteoh, maurits]

- Add default icon for top-level contentview toolbar entries
[alecm]

- Remove commented out viewlet (meant for Plone 3) and its related template.
[gforcada]

- Adapt code to some deprecated methods getting finally removed.
[gforcada]

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Bug fixes:

- Document byline viewlet is now displayed only to anonymous users if permitted by the `Allow anyone to view 'about' information` option in the `Security Settings` of `Site Setup` (closes `CMFPlone1556`_).
Code used to show the lock status and history view was removed from the document byline as this information was not available to anonymous users anyway.
[hvelarde]