Refacting post_info.jsx to be an example for ES6 class syntax

web/react/components/post.jsx

@@ -3,7 +3,6 @@
 
 var PostHeader = require('./post_header.jsx');
 var PostBody = require('./post_body.jsx');
-var PostInfo = require('./post_info.jsx');
 var AppDispatcher = require('../dispatcher/app_dispatcher.jsx');
 var Constants = require('../utils/constants.jsx');
 var UserStore = require('../stores/user_store.jsx');
@@ -13,6 +12,8 @@ var client = require('../utils/client.jsx');
 var AsyncClient = require('../utils/async_client.jsx');
 var ActionTypes = Constants.ActionTypes;
 
+var PostInfo = require('./post_info.jsx');
+
 module.exports = React.createClass({
     displayName: "Post",
     handleCommentClick: function(e) {