Update dep engine.io to v1.5.3

Closes socketio#2228

Author: SpainTrain

.travis.yml

@@ -3,6 +3,7 @@ node_js:
   - "0.8"
   - "0.10"
   - "0.12"
+  - "4.0.0"
 
 git:
   depth: 1

Readme.md

@@ -1,7 +1,7 @@
 
 # socket.io
 
-[![Build Status](https://secure.travis-ci.org/Automattic/socket.io.svg)](http://travis-ci.org/Automattic/socket.io)
+[![Build Status](https://travis-ci.org/socketio/socket.io.svg)](https://travis-ci.org/socketio/socket.io)
 ![NPM version](https://badge.fury.io/js/socket.io.svg)
 ![Downloads](http://img.shields.io/npm/dm/socket.io.svg?style=flat)
 [![](http://slack.socket.io/badge.svg)](http://slack.socket.io)

package.json

@@ -18,10 +18,10 @@
     "url": "git://github.com/Automattic/socket.io"
   },
   "scripts": {
-    "test": "mocha --reporter dot --slow 200ms --bail"
+    "test": "mocha --reporter dot --slow 200ms"
   },
   "dependencies": {
-    "engine.io": "automattic/engine.io#f3fd4bb",
+    "engine.io": "1.5.3",
     "socket.io-parser": "2.2.4",
     "socket.io-client": "automattic/socket.io-client#bf98153",
     "socket.io-adapter": "automattic/socket.io-adapter#de5cba",