Ftw.sliderblock

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- Fix init loading issue. This was a regression from 1.6.0. [mathias.leimgruber]

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- Use new dropzone based upload solution of ftw.simplelayout 2.x [mathias.leimgruber]

- Add Plone 5.1 support [busykoala]

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- Use title, or alt text of image as "dot" text. If there is none, use index as fallback. [mathias.leimgruber]

- Use alt text from ftw.slider 3.1.6 if available. [mathias.leimgruber]

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- Hide slider pane inneredit icon when editmode is disabled [Nachtalb]

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- Implement image-limits and imagecropping for sliderblock. [elioschmutz]

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- The Slick default config (used when creating a slider block)
can be customized trough a registry record. [mbaechtold]