title: Bootbox and Font awesome icon in button
body: <p>I'm using bootbox plugin for bootstrap modals.
  I would like to know how to put an F.A. icon inside a bootbox dialog button.</p>
  
  <p>This is my code:</p>
  
  <pre><code>bootbox.dialog({
          className: "modal-danger nonumpad",
          closeButton: false,
          animate: false,
          title: '...',
          message: "...",
          onEscape: null,
          buttons: {
              refresh: {
                  label: "Refresh",
                  className: "btn-warning btn-lg pull-left",
                  callback: function(){
                      return false;
                  }
              },
              main: {
                  label: "Setup",
                  className: "btn-primary btn-lg",
                  callback: function(){
                      return false;
                  }
              }
          }
      });
  </code></pre>
  
  <p>I just need to append inside the bootbox buttons a <code>&lt;i&gt;</code> element with a custom class:</p>
  
  <pre><code>&lt;i class="fa fa-check"&gt;&lt;/i&gt;
  </code></pre>