Merge pull request #23 from RKJuve/styling

styled landing page background
changed classroom updates to emite entire classroom object, fixed undefined bug in joining classroms, added App.socket.removeAllListeners to stop listening to events once the corresponding routes have been left
Merge pull request #24 from RKJuve/patrick

changed classroom updates to emite entire classroom object, fixed undefi...
fixed landing image removal when you go to a new page, changed some styling