Grady/ai authoring

Transitioned back to AI grading as a Text box within the Authoring interface, and did the appropriate behind the scenes work (validation, primarily) to make sure that the examples are being proper validated.
Yeah - @gradyward and I talked about it yesterday. We're adding more instructions to the UI to save space (and awkward wording) in the validation message. Since the validation message kicks the user back to the UI, which will have more instructions in it, users should be able to find whatever is causing the problem fairly easily.