title: wysihtml5 override link dialogue behaviour
body: <p>I want to be able to add arbitrary text as link hrefs using <a href="https://github.com/xing/wysihtml5">wysihtml5</a>. For example: I want to generate this <code>&lt;a href="[~55~]"&gt;link&lt;/a&gt;</code></p>
  
  <p>I have worked out how to do this -- here's a simplified example of what I'm doing:</p>
  
  <pre><code>editor = new wysihtml5.Editor("text_area_content", {toolbar: "wysihtml5-toolbar"})  
  editor.composer.commands.exec("createLink", { href: "[~"+55+"~]" })
  </code></pre>
  
  <p>The problem I now have is that, after creating a link, when this link is selected in the editor, the dialog box shows the link as "http://current_url/[~55~]". I want it to show just "[~55~]".</p>
  
  <p>I have tried to bind a new event to links within the editor, but I couldn't work out how to do that (since they are in an iframe).</p>
  
  <p>How can I get the wysihtml5 link dialog to show the link address without displaying the current url?</p>