Merge pull request #73 from spilgui/master

admin: reword some help texts
Fix order_by in reschedule method.
Merge pull request #74 from brocaar/fix_order_by

Fix order_by in reschedule method.
Remove check that last run has completed (which should not be the case). Update tests.
Merge pull request #75 from brocaar/fix_order_by

Remove check that last run has completed (which should not be the case)....
Handle error response when it is not accessible (e.g. when a worker was removed from the pool).
Merge pull request #76 from brocaar/handle_worker_request_error

Handle error response when it is not accessible (e.g. when a worker was ...
Show full chain of jobs.
Catch infinite loops when displaying job-chains.
Update README.
Validate that there is no recursion in the job-chain.
Remove recursion check again (since this is now done on model level).
Update README. Bump version.
Fix typo.
Merge pull request #77 from brocaar/show_full_job_tree

Show the full job-chain on the jobs page.
Warn that suspending a job affects its children.
Merge pull request #78 from brocaar/show_full_job_tree

Warn that suspending a job affects its children.
Bump version.
Add worker_version and concurrent_jobs fields to the Worker model and resource.
Make worker_version and concurrent_jobs visible in admin.