title: CakePdf plugin wkhtmltopdf binary is not found
body: <p>I am trying to implement this plugin <a href="https://github.com/ceeram/CakePdf" rel="nofollow">https://github.com/ceeram/CakePdf</a>  </p>
  
  <p>In my view methods I have add this code </p>
  
  <pre><code>   public function view($id = null) {
         $this-&gt;User-&gt;id = $id;
          $this-&gt;autoRander="false";
          if (!$this-&gt;User-&gt;exists()) {
              throw new NotFoundException(__('Invalid user'));
          }
            $this-&gt;pdfConfig = array(
                  'orientation' =&gt; 'portrait',
                  'filename' =&gt; 'User_' . $id
              );
  
          $this-&gt;set('user', $this-&gt;User-&gt;read(null, $id));
      }
  </code></pre>
  
  <p>I also add </p>
  
  <pre><code> Configure::write('CakePdf', array(
          'engine' =&gt; 'CakePdf.WkHtmlToPdf',
          'options' =&gt; array(
              'print-media-type' =&gt; false,
              'outline' =&gt; true,
              'dpi' =&gt; 96
          ),
          'margin' =&gt; array(
              'bottom' =&gt; 15,
              'left' =&gt; 50,
              'right' =&gt; 30,
              'top' =&gt; 45
          ),
          'orientation' =&gt; 'landscape',
          'download' =&gt; true
      ));
  </code></pre>
  
  <p>Now problem is when I am trying to execute this code that have given me this error <strong>wkhtmltopdf binary is not found or not executable: /usr/bin/wkhtmltopdf</strong> I have install wkhtmltopdf. Here in CakePdf plugin code they have used   </p>
  
  <pre><code>protected $binary = '/usr/bin/wkhtmltopdf';
  </code></pre>
  
  <p>How can I used this engine to solve it?How can I determine this path ?</p>