Update to express 4.

lib/roles/storage/temp.js

@@ -4,6 +4,7 @@ var path = require('path')
 
 var express = require('express')
 var validator = require('express-validator')
+var bodyParser = require('body-parser')
 var formidable = require('formidable')
 var Promise = require('bluebird')
 
@@ -22,7 +23,7 @@ module.exports = function(options) {
   app.set('case sensitive routing', true)
   app.set('trust proxy', true)
 
-  app.use(express.json())
+  app.use(bodyParser.json())
   app.use(validator())
 
   storage.on('timeout', function(id) {