npm shouldn't install testing dependencies

I also noticed that the last test is failing with the follow error, but I don't think it's related:

```
[Error: Request returned 500: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<title>500 Internal Server Error</title>
<h1>Internal Server Error</h1>
<p>The server encountered an internal error and was unable to complete your request.  Either the server is overloaded or there is an error in the application.</p>
 ]
```