Add better bad request messages for schedules
Change retentions warnings to info
Scheduler to stop backtracking to make jobs
Merge pull request #120 from esheffield/master

Don't hand out DONE jobs for processing.
Merge pull request #121 from ameade/scheduler-current-time

Scheduler to stop backtracking to make jobs
Merge pull request #122 from ameade/better-err

Minor tweaks
Trying to fix version problem for jenkins