Collective.js.galleria

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- Nothing changed yet.

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- Fix ``AttributeError`` when trying to create a Plone Site on an instance that has
``collective.js.galleria`` available.
[wesleybl]

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- Allows using resources with ``++plone++`` in CSS definition URL of Galleria theme.
[wesleybl]

- Use ``uglify-js`` node package to uglify Javascript.
[wesleybl]

- Use plone resource instead of browser resource.
[wesleybl]

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- Add support to Python 3.6, 3.7 and 3.8.
[cleberjsantos]

- Add support to Plone 5.2.
[cleberjsantos]

- Drop support for Plone 4.x
[cleberjsantos]

- Update galleria to 1.6.1
[clebejsantos]

- Add replacement for //resource// links for manually added css back in the
1.6.1 galleria.js as written in the general notes (Based on changes in `0d2b832 <https://github.com/collective/collective.js.galleria/commit/0d2b8322ae90c0f746fd61a44c6164bc78b6c2d7#diff-7e954f54cc66afe1ef20acaf30599e1abba9bfde1c0bb92f25886b8eaa9d4db6>`_)
[cleberjsantos, fredvd]

- Add replacement in galleria.js for avoid error with jQuery load
[cleberjsantos]

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- Add plugins as browser resources directory
[cleberjsantos]
- Add travis-ci integration with test + python-validation
[cleberjsantos][toutpt]

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- Update galleria to 1.2.9