Rename QuestionHandler::getEntityView() to ::view(), add it to interface.
Remove QuestionHandler::getFormat().
Fix bad ResponseHandlerBase::getResponse().
misc
QuestionFeedbackController does not need $quiz param.
Issue #2387623 by thehong: Provide easy way to question handler to handle 'onRepeatUntilCorrect' event.
Try to fix broken test case.
Fix upgrade test case.
Merge pull request #32 from atdrupal/6x-improvements

Bug fixes