title: npm run dev command does not work on vuejs' hackernews example
body: <p>I am trying to run the vue-hackernews-2.0 example from vuejs' github <a href="https://github.com/vuejs/vue-hackernews-2.0" rel="noreferrer">repository</a> </p>
  
  <p>In setup section it explains how to install the project:</p>
  
  <pre><code># install dependencies
  npm install # or yarn
  
  # serve in dev mode, with hot reload at localhost:8080
  npm run dev
  
  # build for production
  npm run build
  
  # serve in production mode
  npm start
  </code></pre>
  
  <p>I did npm install. After changing the port to 8888 in server.js I typed "npm run dev" on command line.</p>
  
  <pre><code>&gt; vue-hackernews-2.0@ dev D:\Users\212399486\WebstormProjects\vue-hackernews-2.0-master
  &gt; node server
  
  server started at localhost:8888
  
  
  DONE  Compiled successfully in 16328ms                                                                                                                                                                                                                        1:02:18 PM
  
  
  DONE  Compiled successfully in 17845ms                                                                                                                                                                                                                        1:02:19 PM
  
  
  webpack built bd162a76119031a85eed in 17845ms
  </code></pre>
  
  <p>When I go localhost:8888 It will just try to load for 1 min and then it fails, without anything on the console.</p>
  
  <p>I thought I should also try "npm run build" and "npm start" so I also used two commands. "npm run build" successfully created the dist file. </p>
  
  <p>But after "npm start" I get this error:</p>
  
  <pre><code>&gt; vue-hackernews-2.0@ start D:\Users\212399486\WebstormProjects\vue-hackernews-2.0-master
  &gt; cross-env NODE_ENV=production node server
  
  module.js:471
      throw err;
      ^
  
  Error: Cannot find module './dist/vue-ssr-server-bundle.json'
      at Function.Module._resolveFilename (module.js:469:15)
      at Function.Module._load (module.js:417:25)
      at Module.require (module.js:497:17)
      at require (internal/module.js:20:19)
      at Object.&lt;anonymous&gt; (D:\Users\212399486\WebstormProjects\vue-hackernews-2.0-master\server.js:41:18)
      at Module._compile (module.js:570:32)
      at Object.Module._extensions..js (module.js:579:10)
      at Module.load (module.js:487:32)
      at tryModuleLoad (module.js:446:12)
      at Function.Module._load (module.js:438:3)
  events.js:160
        throw er; // Unhandled 'error' event
        ^
  
  Error: spawn node ENOENT
      at notFoundError (D:\Users\212399486\WebstormProjects\vue-hackernews-2.0-master\node_modules\cross-spawn\lib\enoent.js:11:11)
      at verifyENOENT (D:\Users\212399486\WebstormProjects\vue-hackernews-2.0-master\node_modules\cross-spawn\lib\enoent.js:46:16)
      at ChildProcess.cp.emit (D:\Users\212399486\WebstormProjects\vue-hackernews-2.0-master\node_modules\cross-spawn\lib\enoent.js:33:19)
      at Process.ChildProcess._handle.onexit (internal/child_process.js:215:12)
  
  npm ERR! Windows_NT 6.1.7601
  npm ERR! argv "C:\\Program Files\\nodejs\\node.exe" "D:\\Users\\212399486\\AppData\\Roaming\\npm\\node_modules\\npm\\bin\\npm-cli.js" "start"
  npm ERR! node v6.11.2
  npm ERR! npm  v3.10.8
  npm ERR! code ELIFECYCLE
  npm ERR! vue-hackernews-2.0@ start: `cross-env NODE_ENV=production node server`
  npm ERR! Exit status 1
  npm ERR!
  npm ERR! Failed at the vue-hackernews-2.0@ start script 'cross-env NODE_ENV=production node server'.
  npm ERR! Make sure you have the latest version of node.js and npm installed.
  npm ERR! If you do, this is most likely a problem with the vue-hackernews-2.0 package,
  npm ERR! not with npm itself.
  npm ERR! Tell the author that this fails on your system:
  npm ERR!     cross-env NODE_ENV=production node server
  npm ERR! You can get information on how to open an issue for this project with:
  npm ERR!     npm bugs vue-hackernews-2.0
  npm ERR! Or if that isn't available, you can get their info via:
  npm ERR!     npm owner ls vue-hackernews-2.0
  npm ERR! There is likely additional logging output above.
  
  npm ERR! Please include the following file with any support request:
  npm ERR!     D:\Users\212399486\WebstormProjects\vue-hackernews-2.0-master\npm-debug.log
  </code></pre>
  
  <p>Screenshot of dist folder: </p>
  
  <p><a href="https://i.stack.imgur.com/WiO9v.png" rel="noreferrer"><img src="https://i.stack.imgur.com/WiO9v.png" alt="enter image description here"></a></p>
  
  <p>package.json scripts:</p>
  
  <pre><code>"scripts": {
      "dev": "node server",
      "start": "cross-env NODE_ENV=production node server",
      "build": "rimraf dist &amp;&amp; npm run build:client &amp;&amp; npm run build:server",
      "build:client": "cross-env NODE_ENV=production webpack --config build/webpack.client.config.js --progress --hide-modules",
      "build:server": "cross-env NODE_ENV=production webpack --config build/webpack.server.config.js --progress --hide-modules"
    },
  </code></pre>