Parallelize stop and restart to be faster with many workers.
Adding information about restarting delayed jobs

This is information I believe is correct, but I would love to know for certain
Documented _without_delay feature
Merge branch 'document-without_delay' of https://github.com/pjungwir/delayed_job into pjungwir-document-without_delay

* 'document-without_delay' of https://github.com/pjungwir/delayed_job:
  Documented _without_delay feature
Merge branch 'patch-1' of https://github.com/allenhancock/delayed_job into allenhancock-patch-1

* 'patch-1' of https://github.com/allenhancock/delayed_job:
  Adding information about restarting delayed jobs
Update documentation on restarting DJ
Add jobs:check rake task to test for liveness.

This task exits with failure status if there are old jobs that have
not been picked up by workers. This can be used for monitoring.
Merge pull request #384 from alexisbernard/parallelize_restart

Parallelize stop and restart to be faster with many workers
Merge pull request #517 from mmb/jobs_check_task

Add jobs:check rake task to test for liveness.