Simply install in contributing. Change websocket dep

CONTRIBUTING.md

@@ -7,16 +7,34 @@ roslibjs Build Setup
 
  1. Install [Node.js](http://nodejs.org/) for your environment
  2. Install the build task runner, [Grunt](http://gruntjs.com/)
+
  	```sh
 	$ [sudo] npm install -g grunt
  	```
+
  3. Install the [Cario](http://cairographics.org/) graphics library
  	- [System specific instaructions](https://github.com/Automattic/node-canvas/wiki/_pages)
  4. Install the dependencies and build dependencies
+
 	```sh
 	$ cd /path/to/roslibjs/
    	$ [sudo] npm install
 	```
+
+
+Easy installation for Ubuntu. `cd` to your local copy of this project.
+
+```sh
+# Install Node.js and NPM
+curl -sL https://deb.nodesource.com/setup | sudo bash -
+sudo apt-get install nodejs
+
+# Install Cario
+sudo apt-get install libcairo2-dev libjpeg8-dev libpango1.0-dev libgif-dev build-essential g++
+
+# Install this projects Deps
+sudo npm install
+```
 
 ### Build with Grunt
 

build/roslib.js

@@ -615,7 +615,7 @@ module.exports = Param;
 var Canvas = require('canvas');
 var Image = Canvas.Image || global.Image;
 var EventEmitter2 = require('eventemitter2').EventEmitter2;
-var WebSocket = require('../util/WebSocket');
+var WebSocket = require('ws');
 
 var Service = require('./Service');
 var ServiceRequest = require('./ServiceRequest');
@@ -987,7 +987,7 @@ Ros.prototype.decodeTypeDefs = function(defs) {
 
 module.exports = Ros;
 }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
-},{"../util/WebSocket":31,"./Service":10,"./ServiceRequest":11,"canvas":32,"eventemitter2":30}],10:[function(require,module,exports){
+},{"./Service":10,"./ServiceRequest":11,"canvas":32,"eventemitter2":30,"ws":31}],10:[function(require,module,exports){
 /**
  * @author Brandon Alexander - baalexander@gmail.com
  */

package.json

@@ -18,14 +18,14 @@
   "dependencies": {
     "canvas": "1.1.3",
     "eventemitter2": "~0.4.13",
-    "nodejs-websocket": "~0.1.4",
     "object-assign": "^1.0.0",
+    "ws": "^0.4.32",
     "xmlshim": "~0.0.9"
   },
   "browser": {
     "canvas": "./src/util/shim/canvas.js",
     "eventemitter2": "./src/util/shim/EventEmitter2.js",
-    "./src/util/WebSocket.js": "./src/util/shim/WebSocket.js",
+    "ws": "./src/util/shim/WebSocket.js",
     "./src/util/DOMParser.js": "./src/util/shim/DOMParser.js"
   },
   "description": "roslibjs",

src/core/Ros.js

@@ -5,7 +5,7 @@
 var Canvas = require('canvas');
 var Image = Canvas.Image || global.Image;
 var EventEmitter2 = require('eventemitter2').EventEmitter2;
-var WebSocket = require('../util/WebSocket');
+var WebSocket = require('ws');
 
 var Service = require('./Service');
 var ServiceRequest = require('./ServiceRequest');