bug 1072493 - Adding more homepage tests, navigation submenu validator, search box expanding, footer dropdown language widget changing

More tests!
This might be a good place to mention that the user might want to insert a single space before running this command, like so...

```
[space here]node_modules/.bin/intern-runner config=intern-local b=firefox,chrome t=auth,homepage d=developer-local.allizom.org u=someone@somewhere.com p=8675309
```

In many shells, this signals that the command should <em>not</em> be saved in history. That's important if the user is entering a real Persona username/password combination.