title: Flipping a sprite with xScale in SpriteKit in iOS 8 doesn't flip the SKPhysicsBody
body: <p>I have a setup where there is an empty <code>SKSpriteNode</code> ("Player") that has N number of <code>SKSpriteNode</code>s as childs (body parts, such as "Arm"). Every child has an <code>SKPhysicsBody</code> created like this:</p>
  
  <pre><code>sprite.physicsBody = SKPhysicsBody(texture: sprite.texture, size: sprite.texture!.size())
  </code></pre>
  
  <p>When I try to flip the whole sprite ("Player) with</p>
  
  <pre><code>self.xScale = -1
  </code></pre>
  
  <p>all the textures are flipped properly, but the <code>SKPhysicsBody</code>s are unaffected. How do I flip the whole sprite with all the children and their <code>SKPhysicsBody</code>s properly?</p>