title: request.body always empty for multipart form data
body: <p>I have the following in the request being sent from the browser:</p>
  
  <pre><code>Remote Address:127.0.0.1:80
  Request URL:http://doctor.com/api/v2/chat/message
  Request Method:POST
  Status Code:501 Not Implemented
  **Response Headers**
  view source
  Access-Control-Allow-Headers:Content-Type,X-Requested-With
  Access-Control-Allow-Methods:POST, GET, PUT, DELETE, OPTIONS
  Access-Control-Allow-Origin:*
  Connection:keep-alive
  Content-Length:61
  Content-Type:text/html; charset=utf-8
  Date:Wed, 24 Jun 2015 11:16:33 GMT
  ETag:W/"3d-70662653"
  X-Powered-By:Express
  **Request Headers**
  view source
  Accept:application/json, text/plain, */*
  Accept-Encoding:gzip, deflate
  Accept-Language:en-US,en;q=0.8
  Cache-Control:no-cache
  Connection:keep-alive
  Content-Length:39235
  Content-Type:multipart/form-data; boundary=----WebKitFormBoundary3qsbh041bbj3MYfd
  Cookie:serviceToken=558a86bb69f3197ab93fd64c
  DNT:1
  Host:doctor.com
  Origin:http://doctor.com
  Pragma:no-cache
  Referer:http://doctor.com/platform/chat
  User-Agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.130 Safari/537.36
  Request Payload
  ------WebKitFormBoundary3qsbh041bbj3MYfd
  Content-Disposition: form-data; name="id"
  
  55896d9bc57f69df66284176
  ------WebKitFormBoundary3qsbh041bbj3MYfd
  Content-Disposition: form-data; name="attachment"; filename="Screen Shot 2015-06-24 at 3.18.10 am.png"
  Content-Type: image/png
  
  
  ------WebKitFormBoundary3qsbh041bbj3MYfd--
  </code></pre>
  
  <p>This request is intercepted by a node server. Here is how it looks:</p>
  
  <pre><code>var express = require('express');
  var http = require('http');
  var bodyParser = require('body-parser');
  var cookieParser = require('cookie-parser');
  var fs = require('fs');
  var path = require('path');
  var request = require('request');
  var _ = require('underscore-node');
  var express = require('express');
  
  app.use(bodyParser.json());
  app.use(cookieParser());
  app.use(bodyParser.urlencoded({extended:false}));
  
  app.use('/api/*', function (req, res, next) {
      console.log(req.body);
  });
  </code></pre>
  
  <p>Problem is that, I always get the req.body as empty. It works fine when the json is posted.</p>