Show right hand card for first item in story package if avaliable

This re-introduces the right hand cards by default on article pages if the piece of content has a curated story package.

As discussed with @kungpochicken this is to gather some usage data whilst we start work on new onward journeys.

![screenshot from 2013-10-22 17 03 54](https://f.cloud.github.com/assets/80089/1382850/c906bb76-3b33-11e3-8993-a1de92e59558.png)

![Table tennis shipping](http://uberpong.com/wp-content/uploads/2012/10/Slow-motion-ping-pong-shot.gif)