added a printScore function that prints the current score - which
updates every time the canvas is printed
reset score to 0 each time snakeInit is called
changed color of scoreboard to gray
added delay for updating score and changed to 1/2 increment updates each
time screen refreshed
updating score for every 1000 interval in the background - independent
of print function
fixed text formatting and a couple of comments
Merge pull request #19 from jasontowens/scoreboard

Scoreboard looks good