Show unpublishing information on drafts

www.agileplannerapp.com/boards/173808/cards/8902

content designers need to know when a draft is a
fresh draft as opposed to a draft that resulted
from an unpublishing.

this is a temporary fix whilst we create a state
called 'unpublished' to represent such editions.
Merge pull request #1907 from alphagov/show-unpublished-state

Show unpublishing information on drafts