title: SKScene scale + anchorPoint = strange behavior
body: <p>I have an empty SKScene which needs to be horizontally centered, so I set it's anchorPoint:</p>
  
  <pre><code>self.anchorPoint = CGPoint(0.5f, 0);
  </code></pre>
  
  <p>I also need to scale it, per <a href="https://stackoverflow.com/questions/19087392/spritekit-set-scale-and-physics/19089279#19089279">SpriteKit - Set Scale and Physics</a>, so I run an action on it like this: </p>
  
  <pre><code>[self runAction:[SKAction scaleTo:0.5f duration:0.0f]];
  </code></pre>
  
  <p>My problem is that when I detect touches, I get locations that seem strangely off.
  I detect touches using the usual (locationInNode:self) method, and I'm currently adding a little blue square where the touches are, but when I touch the 4 corners of my device, I see a frame that is a quarter of my screen (correctly) but is moved to the left by a seemingly arbitrary amount</p>
  
  <p>Here are some things I've already checked:</p>
  
  <ul>
  <li>scene is initialized in viewWillLayoutSubviews, I know it has the correct initial dimensions</li>
  <li>scene's scaleMode is set to SKSceneScaleModeAspectFill, but I've tried all of them to no avail</li>
  </ul>