Eea.facetednavigation

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* Feature: Add custom CSS class to a widget css classes
[balavec]

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* Change: Trigger FacetedSettingsWillBeChangedEvent before faceted settings change
[avoinea]

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* Fix an issue with ContentListing when filtered search results is
a generator (e.g. when using alphabetic widget)
[pbauer]
* Allow solr to be not installed or not enabled
[pbauer]

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* Bug fix: Fix "test_doctests.Py23DocChecker" that was hidding failing doc
tests by wrongly testing on "want" instead on "got".
[gbastien refs 203]
* Feature: In GenericSetup import profile, take into account the "purge"
attribute at the <criterion> level like it is done at <criteria> level.
[gbastien]

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* Upgrade step: Within "Plone > Site Setup > Add-ons" click on
upgrade button available for eea.facetednavigation. If you still get a
JS error with autocomplete facet after this upgrade,
go to Site Setup > Resource Registries and enable, then disable
Development Mode for Faceted Bundles.
[avoinea refs 196]
* Feature: Add possibility to hide Search button with solr autocomplete facet
[avoinea]
* Bug fix: Fix autocomplete solr facet CSS with Plone 5
[avoinea]
* Bug fix: Fix select2 JS error when using autocomplete solr facet
[avoinea refs 196]

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* Bug fix: make sure orphans used in FacetedQueryHandler.query is an integer
when using Py3 or it turns b_size to a float value that breaks plone.batching
Fixes https://github.com/eea/eea.facetednavigation/issues/197
[gbastien]