4a98e4626a
In Studio: Introduces a new option, `after some number of attempts` and a new entry box for specifying the number of attempts. This allows course creators to specify that a given question's answer is only viewable, i.e its show answer button is visible, after the learner has attempted answering the question - by hitting the submit button - a given number of times. Included in this commit are unit tests for the new feature.