Fullscreen mode and window resize

On this update, the following features has been added to the game:

• Full screen mode for the web version and Full screen and windows rezise features for the windows version.
  • This should help player's playing on a LapTop or small screen to be able to play the game aswell.

• The background of the game have been updated and now it's a little bit brighter. 
  • This is because I wanted to differenciate the background of the page from the background of the game, which were the same image and player could not see the end of the game screen.