title: jsTree contextmenu issue
body: <p>This should be a really simple question, but I can't seem to find the answer anywhere.  I've recently (like today) began using jsTree and I just got my first tree set up.  I created an unordered list of just static text:</p>
  
  <pre><code>&lt;ul&gt;
    &lt;li&gt;one&lt;/li&gt;
    &lt;li&gt;two&lt;/li&gt;
    &lt;li&gt;three&lt;/li&gt;
  &lt;/ul&gt;
  </code></pre>
  
  <p>My code to do a jsTree looks like this:</p>
  
  <pre><code>$(document).ready(function () {
          $("#demo1").bind("select_node.jstree",
                  function(event, data) {
                      //DO SOMETHING WHEN A NODE IS CLICKED
                  }).jstree();
  });
  </code></pre>
  
  <p>Then I try to add a context menu.  Using the following:</p>
  
  <pre><code>$(document).ready(function () {
          $("#demo1").bind("select_node.jstree",
                  function(event, data) {
                      //DO SOMETHING WHEN A NODE IS CLICKED
                  }).jstree({plugins: ["contextmenu"], contextmenu: {items: customMenu}});
      });
  </code></pre>
  
  <p>customMenu is a simple function that returns an object.</p>
  
  <p>When I execute the first code, I get my jsTree and it collapses and expands.  When I execute the second one, the area where the jsTree is says "Loading..." and that is all. If I right-click that word, I DO get the menu.</p>
  
  <p>Any suggestions?</p>
  
  <p>if, when I point it to the function customMenu, I add the <strong>()</strong>, then I get a really strange menu that has:
  -create
  -rename
  -delete
  -edit
   --cut
   --copy
   --paste
  --Add Group
  --delete</p>
  
  <p>I'm not sure I know what's going on.  I changed the function name to something different to be sure I wasn't getting a jQuery or jsTree function, but I still get the strange behavior. Any suggestions?</p>