Delete question

[ddfridley]

The app/component/questions.js component has the ability to add questions, but not delete them.

• Propose a new UX for deleting questions and review with group. Make it easy for new users to understand.
• Implement/ The deleted question will need to be removed from the object and the changed questions upserted, and the last entry upserted with a value of undefined. eg upsert( {questions: {"2": {"text": "this is the last question}, "3": undefined}}})
• app/components/script.js needs to correctly handle the deletion of a question.