Snake v1.3

Use the arrows keys to move and eat food.
The score decrease when you don't eat.

Don't eat yourself !
Don't collide in the edges!

Good play !

Version 1.1:
    -Improved the score display 
    -Improved hi-score display
    -Hi-score is now save locally in the
     browser
Version 1.2:
    -Improve the stage
    -Limit snake movements inside bounds
     of stage
    -Improve the snake movements
Version 1.3:
    -Improve the display of snake
    -Add rock
    -Correction of elongation of the snake
    -Improve the difficulty control (Sprite
     design)
    -Improve the snake control