Screenshot

A script to make screenshot from a list of URL (staging.webcompat.com or webcompat.com or localhost:5000) and several resolutions. 

It uses phantomjs for webkit  and slimerjs for gecko.

It is necessary to install these components:

```
[sudo] npm install casperjs@1.1.0-beta3
[sudo] npm install phantomjs
[sudo] npm install slimerjs
```

![cab-window-615](https://cloud.githubusercontent.com/assets/1997108/4260702/bd41fcee-3b49-11e4-8037-db76691bab7d.gif)