Collective.documentviewer

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- fix support for archetypes
[vangheem]

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- add lead image support
[vangheem]

- be able to use collective.celery for queuing tasks
[vangheem]

- fix async monitor registration
[pilz]

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- fix Plone 5 compatibility
[vangheem]

- upgrade jquery.imgareaselect to latest
[vangheem]

- upgrade document viewer to latest
[vangheem]

- do not support upgrading from wildcard.pdfpal and wc.pageturner anymore. Use 3.x series
[vangheem]

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- set response header on javascript variable file. Prevents js errors on chrome.
[vangheem]

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- fix bug where it wouldn't work with collective.geo.*
[vangheem]

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- add german translation
[jhb]