New Exercise (Trello Card #425): Conditional Statements and Truth Value

http://sandcastle.khanacademy.org/media/castles/camaration:logic1/exercises/conditional_statements_and_truth_value.html

This exercise follows Ben Eater's description very closely: https://docs.google.com/document/d/1bPmPYMeE8E8P7SNLuEm7muHbN-1aVPOX6BcSXyjP8EM/edit