Ftw.slider

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- Add ftw.slider portal_types translations to plone domain. [tinagerber]

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- Provide precompiled bundle [buchi, Nachtalb]

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- Add classifier for Plone 5.1 support. [busykoala]
- Fix pixel rounding issues on slick slider [Nachtalb]
- Add effective and expiry date on slider container / pane [Nachtalb]

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- Add "random" config parameter to display the slides in a random sort order on each reload. [elioschmutz]

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- Add plone 5.1 support and remove portalMessage about redirect. [busykoala]

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- Actually use label also as aria-label and improve them. [mathias.leimgruber]