Add scenario to define what we want to happen with minister ordering
Fill in steps to show what we want to achieve for ministerial ordering
Extract roles presenter handling from organisations controller

We then pull it into ministerial roles controller so that ministerial ordering for an org is presented the same by both views.
Merge pull request #431 from alphagov/use-org-minister-ordering-on-ministers-page

Use org minister ordering on ministers page

https://www.pivotaltracker.com/story/show/43835461