title: How to get the selected value/key from PSMultiValueSpecifier?
body: <p>in my <strong>Settings.bundle</strong> I have defined a PSMultiValueSpecifier. Now I want to read the <strong>selected</strong> value.</p>
  
  <p>This is how I read a simple text from <code>Settings.bundle</code> text field</p>
  
  <pre><code>[[NSUserDefaults standardUserDefaults] stringForKey:@"name_preference"];
  </code></pre>
  
  <p>Any idea how to read the selected multi value?</p>