Add world location transition bar to world pages

This will let people know what is happening when we turn on the
redirections.

https://www.pivotaltracker.com/story/show/46617493
Update Hansard link

https://www.pivotaltracker.com/story/show/46697629
Merge pull request #375 from alphagov/world-bar

Add world location transition bar to world pages

https://www.pivotaltracker.com/story/show/46617493