Revert "Revert "Country questions"" [MERGE FIRST]

Reverts alphagov/smartdown#93

Sorry for the git mess.
Still not quite sure how that's a good idea: probably a separate story, but between the ```to_s```, ```humanize```, ```value``` methods on those answers objects I am growing increasingly confused as to what we actually want to keep around and how... @FriedSock @karlentwistle @dsingleton  interested to know if you have any reckons as to what we should do with those