Add ability to draw at true size to game class.
Draw background canvas at true-ish size.

Draws slightly larger than it needs to.
Clear the right size rect on draw loop.
Change redraw speed for canvas.
Remove duplicate line.
Draw player at full size.
Draw fruit at full size.
Draw death screen at full size.
Draw pause screen at full size.
Draw pause button in correct place.
Fix bug in render the tail of the snake.
Merge pull request #2 from nathggns/issue-2

Get's blurry at certain screen sizes.