Create an Express.js app that outputs "Hello World!" when somebody goes to `/home`.

The port number will be provided to you by {appname} as the first argument of
the application, i.e., `process.argv[2]`.

Run `$ killall node`  before verifying exercises (in your terminal on Mac OS X) to end any previous processes.

For Windows, use "taskkill /IM node.exe" in Command Prompt.

Don't forget to install the Express module if you haven't already.

```
$ npm install express --save
```

-----------------------------

## HINTS

This is how we can create an Express.js app on port 3000, that responds with
a string on `'/'`:

```js
const express = require('express')
const app = express()
app.get('/', function(req, res) {
  res.end('Hello World!')
})
app.listen(3000)
```

In your solution, please use `process.argv[2]` instead of a fixed port number:

```js
app.listen(process.argv[2])
```

Videos: http://bit.ly/1jW1sBf.