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
Apply useful comments to the code.

- Reduced str func call from column display in admin page.
- Tailing \n in migration step.
- Made change from normal count func to aggregate func in order to
reduce db call.
- Added http404 return at slumber ops in case of no target group.
- Added slumber ops test in case of error appear.
Correct package details
Added newline at 2nd migration step
Merge pull request #7 from vernomcrp/develop

Add group model for grouping jobs, slumber operation for that model