Fix problem with matching answers that contain HTML entities.

At line 367, decodes HTML entities in trueAnswers so the comparison
against selectedAnswers will work correctly when the original answer
contains HTML entities.

    To duplicate problem:

    Create a true answer that contains HTML entities such as this:

    {"option": "This is the correct &ldquo;answer&rdquo;.", "correct": true}

    Run the quiz and select the correct answer and it will return incorrect when it should return correct.