Collective.lazysizes

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

- Upgrade lazysizes to v4.0.1. Twitter plugin is now CommonJS compatible.
[hvelarde]

- Require plone.app.registry >=1.5. Refs 42
[erral]

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

- Add German translations.
[thet]

- Add explicit i18n message ids instead of implicit based on the translation string.
[thet]

- Fix Plone 5 compatibility.
[thet]

- Extend the ``uninstall`` profile with more de-registrations.
[thet]

- Fix the blacklist XPath selector to also match elements with the class directly set on it.
[thet]

- Add configlet option to enable lazy loading for authenticated users.
[hvelarde]

- Avoid possible overriding of ``css_class_blacklist`` while upgrading.
[hvelarde]

- Avoid possible ``ConfigurationConflictError`` on upgrade step registration.
[hvelarde]

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

- Update lazySizes to v3.0.0.
[hvelarde]

- Remove respimg polyfill plugin.
[hvelarde]

- Fix ``UnicodeEncodeError`` on logger.
[hvelarde]

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

- Clean up configlet;
the ``image_candidates`` field was removed as the intended functionality will be included in Plone's core in the near future (see `PLIP 1483 <https://github.com/plone/Products.CMFPlone/issues/1483>`_).
[hvelarde]

- Remove dependency on five.grok.
[hvelarde]

- Update lazysizes to v2.0.5.
[hvelarde]

- Pin version of Products.ResourceRegistries >=2.2.12 to fix upgrade step.
[rodfersou, hvelarde]

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

- lazysizes was upgraded to version 2.0.0 and we are using now the AMD module (closes `20`_).
[rodfersou]

- Do not raise an exception in case Twitter's embed code was somehow modified (closes `17`_).
[hvelarde]

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

- Embedded tweets are now also lazy loaded (closes `15`_).
[aFarkas, rodfersou, hvelarde]

- Package is now compatible with Plone 5.0 and Plone 5.1.
[hvelarde]