title: Writing handler for UIAlertAction
body: <p>I'm presenting a <code>UIAlertView</code> to the user and I can't figure out how to write the handler. This is my attempt:</p>
  
  <pre><code>let alert = UIAlertController(title: "Title",
                              message: "Message",
                       preferredStyle: UIAlertControllerStyle.Alert)
  
  alert.addAction(UIAlertAction(title: "Okay",
                                style: UIAlertActionStyle.Default,
                              handler: {self in println("Foo")})
  </code></pre>
  
  <p>I get a bunch of issues in Xcode.</p>
  
  <p>The documentation says <code>convenience init(title title: String!, style style: UIAlertActionStyle, handler handler: ((UIAlertAction!) -&gt; Void)!)</code></p>
  
  <p>The whole blocks/closures is a little over my head at the moment. Any suggestion are much appreciated.</p>