Move getCurrentPageNumber() method to FormSubmission().
Rename QuestionHelper to TakingHelper.
Create DefaultPropertiesIO class, move reading methods to this new one.
Move writing methods for quiz default properties to correct class.
Add quiz_controller(), shortcut to quiz controller object.
Move calculateScore() from ResultHelper to result controller.
Add $reset param to quiz_entity_single_load().
Move getQuestions() method from QuizHelper to QuestionLoader class.
quiz node -> entity in QuizEntityTakingTestCase.
$quiz->nid => $quiz->qid.
Add /quiz/%/devel tab.
Make use of configured permissions in quiz_entity_access_callback.
Clean up QuizHelper::isAvailable().
Fix broken QuizEntityTakingTestCase.