Added functionality to edit existing quizzes. 

Added a done button. Added a way to edit quiz name. Added support for sessions. I wasn't able to get any kind of "save all" working. When I put it all in one form it caused the loop to print all the questions on one page. Also I added some basic checking to make sure the user actually owns the quiz before they can edit quizzes, delete questions or save quizzes. This probably needs to be converted to however we are doing permissions. Currently the delete function is not working. This is due to the models not properly deleting. This can be fixed by updating the database or the models. Also there is currently no validation of any kind.