New feature about display my external ip

I made some simple code with ip module.
This is simple idea.
When I work with http-server, many time I forgot ip address for mobile web browser test.
The example here below.

![2014-12-13 10 24 03](https://cloud.githubusercontent.com/assets/1798916/5421947/646f45d0-82b2-11e4-9515-7c8fde64218f.png)
`vows` and `fashion-show` shouldn't be in `dependencies`. Aren't they already in `devDependencies`? You're very close I think this is the last thing before I merge it :+1: