Add adjusted net income calculator
Calculate adjusted net income

Adds the ability to perform an adjusted net income calculation
with the child benefit tax calculator.
Only strip specific characters from numeric input
Expose adjusted net income calculator
Expose adjusted net income calculator values
adjusted net income fields
Remove redundant methods
Use cleaner syntax for dynamically setting attr_reader
Remove old helper methods and add money input helper
Use money input helper in form
css updates
updated css on details tag
update css for label tags
Pass adjusted net income params via controller
Remove unused attr
Fix param parsing for monetary values

Also add outgoing_pension_contributions to adjusted net income calculator.
css for validation summary
Merge branch 'calculate_adjusted_net_income' of github.com:alphagov/calculators into calculate_adjusted_net_income
validation messages
Merge remote-tracking branch 'origin/calculate_adjusted_net_income'