Summary
We're accumulating a lot of tests which exercise pipeline creation and modification. But one place we're missing coverage is in the deletion of steps and stages. Once this ticket is complete, we will probably have:

• Methods in EditorPage.java along the lines of deleteStep(String stageToModify, String stepToDelete) and deleteStage(String stageToDelete).
• Verification that the steps/stages are actually getting deleted, and that the pipeline still works afterward.