Add started and completed time stamps to a Job
Include started/completed date/time stamps

This flows through to the UI too
Maintenance worker lives

But UI is not happy about jobs suddenly vanishing!
Trigger refresh on job cleanup

An event needs to be emitted in order to alert the UI that the jobs should be refreshed.
Adjust frequency of maintenance worker
Merge pull request #67 from michaelmarconi/maintenance-worker

Maintenance worker