Add quiz and quiz submission base classes and test cases
Add quiz files.

Quiz submission files are very basic.
add quiz submission models
Quiz Submission model checkin.
added ability to create quizes and questions
quiz grader implementation
Add QuizGrader test
finished logic for the ability to add and remove answers for multipe-choice questions
replaced deprecated app_controller.php and users_controller.php from bill's branch | started logic for quiz taking
partial working quiz taking capabilities. Modified DB structure a bit to become somewhat more cohesive
finished logic for taking quizes. | added a new database backup as an example because the schema is slightly changed
Update GUIs for adding/editing quizzes
remove unneeded function
Get quiz submissions controller test working.
fix sql file