Update app.js

Passed in the click event for preventDefault on handleSubmit

Author: jaylandro

examples/commentsBox/js/app.js

@@ -28,8 +28,8 @@ var CommentList = React.createClass({
 
 
 var CommentForm = React.createClass({
-  handleSubmit: function() {
-    event.preventDefault();
+  handleSubmit: function(e) {
+    e.preventDefault();
     var author = this.refs.author.getDOMNode().value.trim();
     var text = this.refs.text.getDOMNode().value.trim();
     this.props.onCommentSubmit({author: author, text: text});