[Feature Request] Lookup where to watch with because.moe

[because.moe](https://because.moe) is an anime streaming search engine. Roboragi should include a link to see because.moe search results for the commented anime.

Mockup:
![image](https://user-images.githubusercontent.com/6174415/64386944-8a4b0980-d008-11e9-9569-59ef4843bb08.png)
