Adds new comment screen

Adds new comment screen when click pitch in on the discussion page;
- When 'hide' is clicked, this screen slides to the bottom;

![untitled](https://cloud.githubusercontent.com/assets/4236592/5459579/13299a8c-8554-11e4-9092-e7513505e3e4.png)

agree on that. But I would suggest something else that makes it simpler and faster (I think) for both the back-end from the front-end, which is to separate even more the requests, like I already discussed with @azevedo-252 

But that's a discussion I would like to have in person actually (or in Council if it gets usable quickly xD)

Just a quick note, please use `Member` instead of `User`, since it's the name being already used in both Council and Headquarters