Revert the sprites

[maurogeorge]

The Player and Mauro sprites are generated as a mirrored image.

The idea here, is to cut the image in the half and do the change of the left and right sprite via JavaScript.

Before this was done using this.player.scale.x = -1. But this approach generates a bug since the sprite is moved outside the box. So when walking from right to left the player sprite be over the pipe and not collide properly.