Add support for submitted_cancel to WorkflowStatusChecker to kill Oozie jobs.
Error when pegasus engine receives request to cancel/retry.
Add support for submitted_retry to WorkflowStatusChecker to rerun Oozie jobs.
Implement client for cancel/retry of workflow runs.
Guard against engines that do not have support for cancel/retry.
Use common engine checking code.
Fix tests, handle null workflow run status.
Deal with wackiness in oozie job configuration representation.
Merge pull request #79 from SeqWare/feature/cancel-retry

Feature/cancel retry