Add labels to form & aria associations for sections
Refactor CSS structure
Replace step icons with those from toolkit
Correct error in rebased template
Rename validation partial & clean out unused
Tidy up

Add comments to application.scss & corrections to
folder structure
Clean out unused files
Kill info box styles
Reposition adjusted net income box

Also includes fixes for commented issues.
Merge pull request #39 from alphagov/form-markup-changes

Form markup changes
Fix tax year validation error

Fix issue with the validation on the tax year param, caused by
the incorrect range construct being used.
Fix CSS selector in the test
Merge pull request #40 from alphagov/fix-tax-year-validation-error

Fix tax year validation error
create call to action to work out adjusted net income
Build internal URLs using GOVUK_WEBSITE_ROOT.

This is so that we can keep continuity when testing
the user flow by linking to the correct preview URL.
Copy changes to error messages
Change internal_links method to point at private frontend when constant set
changed test to reflect copy changes
Merge pull request #41 from alphagov/income-button

Multiple fixes to calculator