title: Add custom NicEdit editor button for youtube videos
body: <p>I've used the nicEdit - <a href="http://nicedit.com/" rel="nofollow">http://nicedit.com/</a></p>
  
  <p>I need to insert the videos from youtube. I need to insert only url for example: <code>http://www.youtube.com/watch?v=4GuqB1BQVr4</code> </p>
  
  <p>and replace to </p>
  
  <p><code>&lt;iframe width="560" height="315" src="http://www.youtube.com/embed/4GuqB1BQVr4" frameborder="0" allowfullscreen&gt;&lt;/iframe&gt;</code></p>
  
  <p>How can i insert the videos from youtube using nicEdit? </p>