title: WKhtmltoimage --scale-w not working
body: <p>I'm trying to create thumbnail from url with <a href="http://code.google.com/p/wkhtmltopdf/" rel="nofollow">WKhtmltoImage</a> by executing this command : </p>
  
  <pre><code>wkhtmltoimage --scale 200 http://google.com google.jpg
  </code></pre>
  
  <p>but return this error : </p>
  
  <p><code>Unknown long argument --scale-w</code></p>
  
  <p>the version of my wkhtmltoimage is : </p>
  
  <p><code>wkhtmltoimage 0.11.0 rc2</code></p>
  
  <p>any suggestion please.</p>