title: Global error message using Gulp Notify & Plumber
body: <p>Is it possible to create a global OnError function that I can pass a title and the error message to?</p>
  
  <p>I'm looking to do something like this for all tasks ran with plumber:</p>
  
  <pre><code>onError = function(error) {
        $.notify.onError({
          title:    'Error',
          subtitle: '&lt;%= file.relative %&gt; did not compile!',
          message:  '&lt;%= error.message %&gt;'   
        })(error);
      };
  </code></pre>