title: How to change icon in jstree?
body: <p>I have the following code:</p>
  
  <pre><code>$('.wpFolders.co_files').bind('select_node.jstree', function (event, data) {
              getFileById(data.args[0].hash.replace('#', ''));
          }).jstree({
              'plugins' : ['html_data','themes','ui','types'],
              'ui' : {
                  'select_limit' : 1
              },
              'core' : {
                  'animation' : 0
              },
              'types': {
                  'default' : {
                      'icon' : {
                          'image' : '/admin/views/images/file.png'
                      }
                  }
              }
          });
  </code></pre>
  
  <p>I have a basic unordered list I would like to have displayed as a list of files. I'm trying to use the "types" to change the icon but I can't for the life of me figure out how to do it. I checked their docs <a href="http://www.jstree.com/documentation/types">link</a> and even when using almost identical code nothing seems to happen.</p>
  
  <p>From my understanding of the code above the default type of my tree should have the icon I specified but nothing happens, all I get is the default folder icon.</p>
  
  <p>Any ideas? Sorry if the question seems basic but I find the documentation hard to follow when trying to do basic things. :)</p>