Remove irregular pay option
Add pay start date to question text
Fix variable name collision
Add hint
Format pay dates table
Fix monthly pay pattern bug.

Refactoring the pay pattern methods as they were messy and unintuitive.
Remove calendar download
Fix statutory rate b calculation
Use step enumerators
Change pay period calculation to be inclusive of pay date
Refactor pay method calculation
Add phrase for paydates
Comment on pay dates range
Merge pull request #308 from alphagov/maternity-v2-updates

Maternity v2 updates