Do not use shared examples

I would like to start a discussion about shared examples. I already asked quickly on slack and it seems I am not the only one to feel the pain because of them. 

I am not sure yet if they should be totally banned or just banned across files (when they are put in `/support/shared_examples`).

So now, FIGHT

![image](http://i.imgur.com/nQZ7lbY.gif)