Remove _quiz_question_teaser_content().
Move _quiz_question_response_get_instance() to quiz_answer_controller()->getInstance().
Follow up last commit.
Clean up AnswerController::getInstance().
Merge branch '7.x-6.x' into questions

* 7.x-6.x:
  Fix strict warnings in **TestCase::setUp() definitions.
  Update README.md
Follow up last commit.
Rename 'quiz_question' entity to 'quiz_question_properties'.
quiz_get_question_types() should throw exception instead of set error message.
Format code.
Fix warnings at /admin/quiz/reports/stats/creator
Fix SQL error in RevisionStatsController::getDateVSTakeupCountChart().
Fix broken test case -- QuizEntityTestCase.
misc
Move quiz_node_prepare() -> quiz_question_node_prepare().
Add comments for QuizEntityTestCase::testQUizEntityWrapper().
Remove quiz_question_has_been_answered().
'quiz_question_latest_quizzes' table is not being used.
Remove quiz_question_node_insert().
Rename _quiz_question_get_implementations() => quiz_question_get_info().
Fix broken test case.