Change number of asteroid fragments from 3 to 2

Author: David Attlee

game.js

@@ -674,7 +674,7 @@ Asteroid = function () {
     this.scale /= 3;
     if (this.scale > 0.5) {
       // break into fragments
-      for (var i = 0; i < 3; i++) {
+      for (var i = 0; i < 2; i++) {
         var roid = $.extend(true, {}, this);
         roid.vel.x = Math.random() * 6 - 3;
         roid.vel.y = Math.random() * 6 - 3;