Start work on V2 of childcare
Update remaining years copy
Add April pension period boundary
Update copy
Update structure following document changes

Start work on the mathematics and calculating costings.
Adjust pension credit date thresholds
Remove retrospective pension credit statement
Add in content for childcare v2
More implementation and testing for childcare calcs
Clean up current rate calculation
Fix some weekly price calculations
Add phrases for outcomes
Split call helpline outcome into 2
Split call_helpline into 2 separate outcomes

Fix some mathematical bugs.
Add some phrase list tests
Remove now untrue comment
Output the cost difference formatted as Money
Fix available_years test
Remove v2 flow and calculator
Merge pull request #254 from alphagov/childcare_v2

Childcare Tax Credits V2