first commit
Add Singapore CPF Year 2014 contribution calculators
Set Ruby version for CircleCI
Update gem description
Add 2015 CPF calculators
Add acceptance test for company A
Fix for determining SPR year category
Refactor BaseCalculator
Use BaseCalculator and override the rates for 2015 calculators.
Remove duplicate code on missed classes.
Racfactor Year2014
Move BigDecimal conversion to BaseCalculator
Add CPFContribution
Doc tweaks
Version 1.0.0
Fix AgeGroup
Refactor common residency methods
Symbolize SPR year category
Version 1.1.0
Update readme example