Merge branch 'hotfix/0.5.2'
Merge branch 'release/0.5.3'
Merge branch 'release/0.5.4'
Add initial migration for current model
Add modified model migration step

- display group info on job admin page
Added test for group model and it's functions
Improve function and add slumber ops

- Replace 2nd migration step with latest update of model
- New slumber ops  to provide progress data
- Add more test for model and slumber ops
Changes a method for testable purpose

- Make change for progress method
- Add mode test for slumber
Merge branch 'develop' of github.com:vernomcrp/django-async into develop