title: Detect tap only on main node/parent, not child nodes
body: <p>I have a moving SKSpriteNode where i detect taps on the scene with TouchesBegan based on the nodes name. 
  This worked perfectly, until i addeed a SKEmitterNode as a child to the moving node leaving a trail of circles behind the moving node.</p>
  
  <p>My touches on the main/parent node is now detected when the SKEmitterNode particle trail is being touched.</p>
  
  <p>How can i only detect touches on my main/parent spritenode, but not on the child nodes of this sprite?</p>
  
  <p><strong>When the sparks that ouside node1.size is tapped, why is "node1" returned in touchesbegan and not "emitter"?</strong></p>
  
  <p>Example GameScene.swift</p>
  
  <pre><code> override func didMoveToView(view: SKView) {
  
      let node1 = SKSpriteNode(color: SKColor.redColor(), size: CGSizeMake(400, 300))
      node1.position = CGPointMake(size.width/2, size.height/2)
      node1.name = "node1"
      addChild(node1)
  
      let emitter = SKEmitterNode(fileNamed: "MyParticle.sks")
      emitter.name = "emitter"
      emitter.zPosition = -1
      node1.addChild(emitter)
  
  }
  
  
  override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
      /* Called when a touch begins */
      let touch: UITouch = touches.anyObject() as UITouch
      let location = touch.locationInNode(self)
  
      let touchedNode = nodeAtPoint(location)
  
      println(touchedNode.name)
  }
  </code></pre>