renders index when signup
Merge branch 'master' of https://github.com/cs147win2014/project

# By mnburkle
# Via mnburkle
* 'master' of https://github.com/cs147win2014/project:
  mobile fixes. changed course page from lab3 stuff
  more fixing buttons for mobile
  fixed button sizes so they still look nice on mobile
  removed annoying alerts on non-working index page, changed assignments page a bit to make more sense. also for some reason the plots don’t work if they aren’t on the “active” tab.