[Review] Error Handling

#### Problem

* The `format_content_for` was accessing **e** instead of using **body**.
* By wrapping any **Faraday** error in `RequestFailed` meant that the stack trace wasn't fully available in the response, I had to pry into the Broker to see what was going wrong.

#### Solution

* Change `e` => `body`.
* Remove `RequestFailed`.

![image.gif](http://i.imgur.com/CrsoJbL.gif)