Smartanswers: Benefits abroad - Content and logic update

https://www.pivotaltracker.com/story/show/73458820
only changes contained in doc 1/3

Code was old, needed some major refactoring.

-Removed separate question of countries Jersey and Guernsey
-Removed all the different instances for the country question
-Added a unique country question
-Removed all the different instances for employer paying ni question
-Added a unique employer paying ni question