title: Getting file contents when using DropzoneJS
body: <p>I really love the DropZoneJS component and am currently wrapping it in an EmberJS component (you can see <a href="https://ember-cli-dropzonejs.firebaseapp.com" rel="noreferrer">demo here</a>). In any event, the wrapper works just fine but I wanted to listen in on one of Dropzone's events and introspect the file contents (not the meta info like size, lastModified, etc.). The file type I'm dealing with is an XML file and I'd like to look "into" it to validate before sending it. </p>
  
  <p>How can one do that? I would have thought the contents would hang off of the <code>file</code> object that you can pick up on many of the events but unless I'm just missing something obvious, it isn't there. :(</p>