[Review] Renderer Integration

#### Problem

The rendering logic has been extracted from this repo to the [Alephant::Renderer](https://github.com/BBC-News/alephant-renderer) gem. However the Publisher is not using the gem.

#### Solution

1. Remove rendering logic from Publisher.
2. Integrate alephant-renderer into Publisher.

![space_guy.gif](http://media.giphy.com/media/100JPq1ylYXEti/giphy.gif)