Made the DynamoDB client Async.
Merge branch 'master' of github.com:guardian/frontend into 404
Merge branch '404' of github.com:guardian/frontend into 404
That TODO is DONE
Merge branch 'master' of github.com:guardian/frontend into 404
Get rid of blocking S3 call.

This controller is now Async...
Tweaking indentation
correct comments are important
Merge branch 'master' of github.com:guardian/frontend into 404
Merge pull request #3653 from guardian/404

Archive controller is now Async