upgrade to express 4.x

cleanup package.json

put errorHandler middleware as the last one

use accepts module instead of req.acceptedLanguages

use normal object notation as it is supported is es5

remove deprecations from auth controller

remove deprecations from groups controller

Revert "remove deprecations from groups controller"

This reverts commit 7cf36295ebbc50c1f2b210a8ab447d7f2c41dba9.

Revert "remove deprecations from auth controller"

This reverts commit deecd701e0551862ba53ea894f2d87a746384fed.

request limit upped to 1mb and 10k chars for query parameters

Upgrade to Express 4.x

website/src/controllers/challenges.js

@@ -297,7 +297,7 @@ function closeChal(cid, broken, cb) {
 /**
  * Delete & close
  */
-api['delete'] = function(req, res, next){
+api.delete = function(req, res, next){
   var user = res.locals.user;
   var cid = req.params.cid;