title: CGImageRelease in Swift
body: <p>In Objc I use <code>CGImageRelease</code> method after the treatment of an image. But in Swift this method is not available.</p>
  
  <p>On the Apple documentation after <code>Retaining and Releasing Images</code> there is a <code>2 Objective-C symbols hidden</code></p>
  
  <p>My question is, why is there no more <code>CGImageRelease</code> in Swift ? And have we to call another method to replace it ?</p>
  
  <p>Thanks !</p>