Student finance calculator - V2

Adding logic for EU students
Changing logic for extra funding questions
Copy changes
legalising documents smartanswer

First build of legalising documents tool
Merge branch 'master' into legalisation-document-checker
removing Student Finance V2 files

SF calculator files shouldn't have been included
removing unnecessary code

ditching code which isn't needed
Merge pull request #231 from alphagov/legalisation-document-checker

Legalisation document checker