EditQuiz

1. Create EditQuizServlet to save the quiz content
2. Edit HandleQuizServlet to modify the delete request and get request
3. Edit QuestionDataManager to modify update method and delete method
4. Edit QuizDataManager to add delete quiz method
5. Edit editquiz page with necessary method and html and all
6. Edit getQuizContent.js
7. Add jquery.form.js to support editquiz page
8. Edit saveUpdates.js
9. Edit web.xml to include the new servlet