Format student finance scenarios in new format

We now include parse scnenarios via Smartdown
and don't rely on YML structure.
We also indicate question grouping with hyphens.
Update animal example simple example with scenarios

Make animal example simple identical in fixtures, lib and smartdown gem.
Add scenarios going through the different ways of going through
the question.
Fix broken plugin in animal example multiple

Date parsing is now done as part of the smartdown answer.
Date.parse would fail on Smartdown::Model::Answer::Date object.
Remove unused outcome from student finance forms flow
Test scenarios for animal example multiple
Tests to run through all scenarios

For every smartdown flow, this runs through all
the scenarios defined for them and:
- checks each set of questions has been asked in the right order
- checks the right outcome has been reached given the answers

Document the scenario checking rake task
Landlord immigration check: fix scenario parsing
Remove old rake task from jenkins build
Correct syntax of test fixture scenarios
Merge pull request #1211 from alphagov/scenarios-testing

Scenarios testing
Marriage Abroad - Amends
Merge pull request #1224 from alphagov/marriable_aboard_amends

Marriage Abroad - Amends
Minimum Wage Calculator V2 files add
Minimum Wage Calculator bug fix
An attempt to make the scoped smart_answers styles more explicit

Scoping means we can overide styles from static.
Making them more explicit reduces knock on effects from changes to
these classes from static.

I have added some comments to highlight some parts that I think could
do with refectoring

https://www.agileplannerapp.com/boards/105200/cards/6024
Merge pull request #1227 from alphagov/minimum_wage_calculator_bug_fix

SA - Minimum wage calculator bug fix
Merge pull request #1220 from alphagov/make-scoped-smart-answers-styles-more-explicit

An attempt to make the scoped smart_answers styles more explicit
Calculate State Pension

Anyone born before 1959-04-06 or born after 1992-04-05 must be asked
how many years between age 16 and 19 were you working and paying
National Insurance Contributions
Merge pull request #1229 from alphagov/calculate_state_pension

Calculate State Pension
UK Benefits abroad SA - V2 files add