Game of Thrones easter egg IA.

Had some spare time at work today and I implemented [this community idea](https://duck.co/ideas/idea/4427/search-valar-morghulis-instant-answer-valar-doh). It's a small Game of Thrones easter egg.

When a user searches for "Valar Morghulis", we simply reply in plain text the response "Valar Dohaeris". See the community idea page for further explanation.

![ddg-got](https://cloud.githubusercontent.com/assets/851595/3966338/0f2eac98-27a2-11e4-82a4-e33d5813b3cd.png)

Should work on all platforms as it's a plain text response.
Align this with "Valar dohaeris":

```perl
return 'Valar dohaeris',
       html => '...';
```