title: icon not displayed on ribbon, the new primefaces 5.1 component
body: <p>When using the following code : </p>
  
  <pre><code>&lt;p:commandButton value="New" icon="ui-ribbonicon-new" styleClass="ui-ribbon-bigbutton" type="button"/&gt;
  </code></pre>
  
  <p>The icon ui-ribbonicon-new is not displayed!</p>
  
  <p>I am using Primefaces 5.1 with jsf 2.1 on glassfish 3.1.
  Can someone help about it.</p>