Fix: Corrected a bug preventing quizzes from being submitted.
Add: Implemented a method to change a user's password.
Add: Implemented password/e-mail changing.
Add: Update the e-mail address information on the page when changing address.
Fix: Prevent users from changing their e-mail to one already in-use.
Change: Instantly show the element rather than animating.
Fix: Require the users password for changing password/email.