Update JobService interface

Let’s keep a consist interface across services: For example, create() to create a new instance of some object A. The JobService defines method names with the pattern *Job, but we can clean things up a bit given that the service performs actions on a job instance.

JobService

• create() - Create a Job
• get() - Retrieve a job
• getLatestVersion() - Retrieve the latest version of a job
• getAllVersions() - Retrieve all versions of a job
• getAll() - Retrieve all jobs
• updateRunState() - Sets job run state to: NEW, RUNNING , COMPLETED, FAILED, or ABORTED

Ideally, we’ll want to address issue #229 first that introduces class JobRunId

[wslulciuc]

For less CRUDy things, we can just continue to name descriptively?

Yep, sounds like a solid naming convention to me! For more service-specific logic / actions, more context on the methods action is preferred.

[wslulciuc]

Fixed #627