Merge pull request #14 from ippon87/rebase4

Rebase4
answer_time is always > 0 (it's not 1970), however undefined !== null
Merge pull request #15 from ippon87/rebase4

grading problem fixed
Support removing tutorials, rejig start.js to match quiz.js more
Don't allow students to hit refresh and get extra time. That's cheating
Make title a little smaller
Don't give Quiz an ajax method, instead hand jQuery to syncAnswers. Wait until any new questions are downloaded before calling it a success
Throw quota errors towards handleError, make load page handle them nicely
Go back to menu on load screens
Don't need a mockup, have a real thing
Don't fall over if there's no answerQueue
Give more informative titles to pages
new low for the timer, 2 was too low say the students