support XXXX credit card number
Merge pull request #20 from yaplas/refactor/validations

support XXXX credit card number
Merge pull request #21 from benjamine/master

some taxes for NY
Merge pull request #22 from benjamine/master

order totals
0.1.4
change address and phone number validations
Merge pull request #23 from yaplas/refactor/validations

change address and phone number validations
fix validate when value undefined