Create v2 of overseas passports

For https://www.pivotaltracker.com/story/show/60506436

Including shared backing data
Map countries to IPS_3 outcome

https://www.pivotaltracker.com/story/show/60506436
Task #1

* Afghanistan, Bangladesh, India, Pakistan mapped to IPS 3 outcome.
* Removed related custom code / data / markup now they are using a
  standard outcome.
* Pairing with @shotclog
Refactor - reduce unnecessary nesting of ifs

Shouldn't change anything.
Updated timescales for passport applications

https://www.pivotaltracker.com/story/show/60506436
Tasks #2-4
Payment variations for passport applications

https://www.pivotaltracker.com/story/show/60506436
Tasks #5
Bangladesh passport application text changed

https://www.pivotaltracker.com/story/show/60506436
Tasks #6
Passport application variations, India & Pakistan

https://www.pivotaltracker.com/story/show/60506436
Tasks #7
More passport return text for India

https://www.pivotaltracker.com/story/show/60506436
Tasks #8
Merge pull request #621 from alphagov/overseas-passport-8x-changes

Overseas passport 8x changes