Whitespace
Fix missing phrase for Russia

- #1 for https://www.pivotaltracker.com/story/show/59402396
Removed countries from retain passport list

- #2 for https://www.pivotaltracker.com/story/show/59402396
New test for afghanistan renewing

There was no test including how_to_apply_retain_passport which I'm about
to alter the behaviour of. Done as a separate commit to demonstrate that
it works before the change.
Whitespace
Variation on retain passport message added

For specified list of countries.

- #3 for https://www.pivotaltracker.com/story/show/59402396
Changed "getting passport" for Cambodia

- #4 for https://www.pivotaltracker.com/story/show/59402396
Updated courier cost for India

- #5 for https://www.pivotaltracker.com/story/show/59402396

I didn't remove the duplication as it will involve unpicking
the costs logic in this case
Copied changes from v1 into v2

https://www.pivotaltracker.com/story/show/59402396
Fixed incorrect context name

Thanks Steve :-) good spot.
Merge pull request #609 from alphagov/overseas-passport-changes

Overseas passport changes