Collective.lineage

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- Nothing changed yet.

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- Drop Python 2.7 support and code cleanup.
[petschki, thet]

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- Add support for Plone 6 while keeping Plone 5 compatibility.
[petschki, thet]

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- Add support for Python 3
[cillianderoiste]

- Fixed for Plone 5.2
[ajung]

- Fix broken image link in README, fix project URL in setup.py
[tkimnguyen]

- Remove extraneous code that was causing a len() deprecation warning, 58
[tkimnguyen]

- require plone.dexterity >= 2.9.3 for Python 3 (55)
[petri,tkimnguyen]

- use pyflakes 2.1.0 to fix tests
[tkimnguyen]

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- Load the image traverser only if plone.app.imaging is installed.
[thet]

- Support registering browser layers for child sites for per-child-site theming.
[rpatterson]

- Simplify travis configuration and fix travis test run.
[thet]

- Depend on ``Products.CMFPlone`` instead of ``Plone`` to not fetch unnecessary dependencies.
[thet]

- Add descriptors.py back in with a placeholder so the site doesn't complain about it missing.
[abosio]

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- Implement new utility method ``parent_site``.
[thet]

- Setup related cleanups.
[thet]

- fix ``IImagingSchema`` traverser for Plone 4, disable in Plone 5
[jensens]

- basic tests for enable/disable childsite
[jensens]

- household chores: make flake-8 happy (utf8-headers), some other minor pep8,
add travis configuration and let tests run against 4.1 to 5.0 (and fixed
them).
[jensens]

- Include ``get_image_traverser`` only when
``plone.app.imaging.interfaces.IImagingSchema`` is available, which is not
the case in Plone 5.
[thet]

- Peel out ``enable_childsite`` and ``disable_childsite`` from the
``lineage_tool`` view, so that it can be easily used programmatically.
[thet]

- We don't want to enable or disable a childsite on a default page. Traverse up,
until a non-default page is found.
[thet]

- Add ``current_childsite`` method to ``lineageutils`` view, which returns
the current lineage subsite object or ``None``, if no lineage subsite is
active.
[thet]

- Re-add the ``lineageutils`` browser page with it's useful ``isChildSite``
method. Fix ``isChildSite`` to be called as a method on it's view.
[thet]

- Added portuguese pt-br translation
[lccruz]