Support multiple question plugins per test case.
Test cases are function test, not unit.
Test cases are function test, not unit (continue)
Define QuizEntity.repeat_until_correct property.
Small improvement for QuestionPlugin base class.
Fix critical bug in quiz_question_module_enable().
Rename AnswerController::getInstance() to ::getHandler().
Remove ResponseHandler::saveResult().
Rename QuizQuestionResponse to ResponseHandler.
Rename ResponseHandler.quizQuestion to *.question_plugin
Question plugin may provide extra buttons, merge buttons to master form.
Avoid PHP warning when save question type that does not provide custom configuration.
Critical bug: Fatal erro on save new scale question type.
Merge pull request #22 from atdrupal/6x-improvements

Various bug fixes