1.1.0rc1

Model changes (please make migrations and migrate when updating):

• Add verbose_name, creator, repeat, and repeat_until fields to Task and CompletedTask

Additional changes:

• Implement Task repetition; see https://github.com/arteria/django-background-tasks#repeating-tasks
• Add priority parameter to decorator
• Extend Task and CompletedTask managers
• The current LTS version of django (1.8.*) is now also tested with the BACKGROUND_TASK_RUN_ASYNC = True setting.