Jobs3: final tweaks

Marian and David paired on this for about 50 minutes. We have spec'd for the absence of the org field in the 'new' form and removed it. We also removed the heading and marked the failing 'edit' view spec as pending.  I split it into 3 commits, so feel free to cherry pick.

We think the next step is probably to spec for the absence of edit, update and destroy actions (with appropriate redirects or 404s), and then to disable those actions.