Added dummy implementation #1

This does nothing, but responds with 200 to every request to `/`

# To test
1. `npm install`
2. `node web.js`
3. Open a new console and run: `curl -I 127.0.0.1:5000`
4. You should see something like this:
```
HTTP/1.1 200 OK
X-Powered-By: Express
Date: Thu, 07 Aug 2014 13:25:31 GMT
Connection: keep-alive
```