title: How to map values of JavaFX observables?
body: <p>I have a <code>SimpleIntegerProperty</code> and want to derive a <code>SimpleObjectProperty&lt;Color&gt;</code> from it. 
  <br>For that I imagine some mechanism like with streams and optionals:</p>
  
  <pre><code>SimpleIntegerProperty intProp;
  ObjectProperty&lt;Color&gt; colorProp = intProp.map(i -&gt; convertIntToColor(i), c -&gt; convertColorToInt(c));
  </code></pre>
  
  <p>Is there something built-in already or do I really need to roll this out on my own? 
  <br>It would seems odd if there is no such thing because looking at all the power of <code>Bindings</code> gives you the strong feeling that this feature should also be there.</p>
  
  <p>Thanks!</p>