Django-datawatch

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- Update changelog and documentation to match patch 1.1.1

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- BREAKING CHANGE! Renamed datawatch_delete_ghost_results management comand to datawatch_clean_up since it's now also deleting ghost executions [Kseniya Potter]

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- Fix celery timezone issue [Leonardo Antunes]

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- Fix accidently bumped version of bootstrap3, bad bumpversion... [Jens Nistler]

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- Set readme to be interpreted as markdown [Jens Nistler]

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- BREAKING CHANGE! switch to celery 4, you now have to add the scheduler task to your CELERYBEAT_SCHEDULE, details in README.md [Jens Nistler]
- BREAKING CHANGE! removed DJANGO_DATAWATCH_CELERY_QUEUE_NAME setting, use task routing instead, see http://docs.celeryproject.org/en/latest/userguide/routing.html [Jens Nistler]
- Update dependencies [Jens Nistler]
- It's time for a 1.0.0 release since datawatch is used internally at RegioHelden for over two years now [Jens Nistler]