Jobs now have an associated 'createdTimestamp'.
This is to facilitate cleanup of old jobs.
Introduced 'save' method, on the way to creating a save/delete/list/get GORM-style interface to the store.
GORM style naming.
Implemented 'delete'.
Implemented list.
Handle deleting list of jobs.
Added cleanup job.
Fixed tests for travis.  Were failing with a `ConverterException`.
Handling bad files in the job directory.
Coding standard
More explicit condition in grep to express intent more clearly.
Method names better match what they're returning
Introduced removeNulls method for clarity, removal of duplication.
Whitespace change
Merge pull request #25 from aodn/job_cleanup

Job cleanup