Added "sauce" and variable speeds
Added "sauce" and variable speeds

- "sauce" is the amount by which a ball bouncing off a paddle
  varies from it's natural reflection angle based on the
  part of the paddle it hit. it is bounded by BALL_MIN_ANGLE
  and BALL_MAX_ANGLE (which are in turn defined in terms of
  absolute value of angle with comparision to x-axis).
- the speed starts at BALL_MIN_SPEED and increases every time
  the ball hits a paddle until it reaches BALL_MAX_SPEED

chuckSMASH/pong