Ftw.publisher.sender

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- Do not warn unpublished references which will now be published. [jone]

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- Extraction: increase attempts to 10 and pause 0.5s in between. [jone]

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- Improve extraction worker. [mbaechtold]

- Add support for Plone 5.1. [mbaechtold]

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- Define a two minute timeout when sending the data to the receiver. [mbaechtold]

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- Execute move jobs synchronously, instead of asynchronously. [mbaechtold]

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- Fix changing the ID of an object (bug only occurred in combination
with Redis). [mbaechtold]

- Make renaming objects on the Plone Site work again. [mbaechtold]