Add sound, see #2

Convert the sounds to ogg (just ogg and mo3 is supported by Inpact)
and play it on the events.

dev/lib/game/entities/ball.js

@@ -6,6 +6,13 @@ ig.module(
 )
 .defines(function(){
   EntityBall = ig.Entity.extend({
+    hitSounds: [
+        new ig.Sound('media/sounds/hit1.ogg'),
+        new ig.Sound('media/sounds/hit2.ogg'),
+        new ig.Sound('media/sounds/hit3.ogg'),
+        new ig.Sound('media/sounds/hit4.ogg'),
+    ],
+    wallSound: new ig.Sound('media/sounds/wall.ogg'),
     name: 'ball',
     size: {x: 24, y: 24},
     collides: ig.Entity.COLLIDES.ACTIVE,
@@ -33,9 +40,16 @@ ig.module(
         // the paddles y movement is added to the ball,
         // so that players can give the ball a spin
         this.vel.y += other.vel.y/2;
+
+        this.hitSounds[Math.floor(Math.random()*4)].play();
       }
     },
 
+    handleMovementTrace: function(res) {
+      if (res.collision.y) this.wallSound.play();
+      this.parent(res);
+    },
+
     reset: function() {
       this.randomVel();
       this.pos.x = this.startPos.x;

dev/lib/game/entities/goal.js

@@ -6,6 +6,7 @@ ig.module(
 )
 .defines(function(){
   EntityGoal = ig.Entity.extend({
+    looseSound: new ig.Sound('media/sounds/loose.ogg'),
     height: 90,
     size: {x:48, y:48},
     checkAgainst: ig.Entity.TYPE.B,
@@ -18,6 +19,7 @@ ig.module(
       if (other.name == 'ball') {
         ig.game.score[this.owner] -= 1;
         other.reset();
+        this.looseSound.play();
       }
     }
   });

dev/lib/game/entities/paddle.js

@@ -21,7 +21,6 @@ EntityPaddle = ig.Entity.extend({
 
 	init: function( x, y, settings ) {
 		this.parent( x, y, settings );
-		
 		this.addAnim( 'idle', 1, [0] );
 	}