- Use 'handler' term instead of 'plugin' when possible.
- Rename QuestionPlugin to QuestionHandler.
- Add interface for response handler, clean things up.
Update quiz_user_results view.
List hook_quiz_feedback_labels_alter() in api file.
Move quizz_update_7100() to correct file.
truefalse_schema_update_7600() is wrong update function name, truefalse_update_7600() is correct.
Improve upgrade path test cases.
Merge pull request #28 from atdrupal/6x-bug-fixes

6x improvements