title: Java 8 U40 TextFormatter (JavaFX) to restrict user input only for decimal number
body: <p>I am looking for an example to restrict user input to only digits and decimal points using the new class <code>TextFormatter</code> of Java8 u40. 
  <a href="http://download.java.net/jdk9/jfxdocs/javafx/scene/control/TextFormatter.Change.html" rel="noreferrer">http://download.java.net/jdk9/jfxdocs/javafx/scene/control/TextFormatter.Change.html</a></p>