Automatically maintain test database
Sort quizzes by popularity

Fixes #220
Make room for button for clearing search
Remove the "Already authenticated" alert message

Fixes #208
Don't allow cheating timer with refreshing

Fixes #201
After giving up on quiz redirect to quizzes
Fix mistake where school name was always the same
Make quiz creation easier

Fixes #232
Use DatabaseCleaner instead of transactions

The hack with shared ActiveRecord connection doesn't work with Rails 4.1
for some reason, so we're just going to use DatabaseCleaner instead.
Show quizzes searching in the URL
Allow students to filter quizzes from their school

Fixes #233