Plone.app.tiles

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- Removed ``plone.namedfile[blobs]`` from the ``test`` extra.
This has been empty since ``plone.namedfile`` 2.0, used since Plone 4.3.0.
[maurits]

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Features:

- test with github actions
[petschki]

Bug fixes:

- Fix imagescaling: missing srcset initialization, and
wrong scale arguments (according to latest p.namedfile).
Add test for imagescaling.
[mamico]

- Fix class security declaration warnings for add/edit/delete views
[petschki]

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- Fix ModuleNotFoundError: No module named 'App.class_init' on Zope 5.
[agitator]

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New features:

- Officially dropped support for Plone 5.0.
No related changes, but we will no longer test with it.
[maurits]

Bug fixes:

- Fix losing an image on edit when it is not changed.
Fixes `issue 36 <https://github.com/plone/plone.app.tiles/issues/36>`_.
[lyralemos, maurits]

- Updated Travis test setup.
Test with Plone 4.3, 5.1, 5.2. Last one on Py 2.7, 3.6. 3.7, 3.8.
[maurits]

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Bug fixes:

- Update trove classifiers
[petschki]

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Bug fixes:

- Python 3 compatible urllib imports
[petschki]

- Fix imagescaling methods, by removing calls of no longer existing __of__ method
[MrTango]