In Scope

• Developer can open the editor in a modal dialog (JENKINS-36887)
• Developer can see the initial state
  • Stage called "Build" with a script step in the step list
• Developer can add stages using the popover (JENKINS-36288)
• Developer can click "add step" and add a new shell script step
• Developer can click on any stage and retrieve its step listing
• Developer can see "Discard changes" or "Save" from the header instead of the close X
• Developer can delete a stage (as per mockup)
• Developer can delete a step (as per mockup)