Irio/mymoip — pull request #31 by hugomaiavieira (2013-09-18 22:57:49+00:00)
Title: Add validation for credit card owner birthday format

When doing this:

``` ruby
credit_card = MyMoip::CreditCard.new(owner_birthday: '80/01/1990')
```

I was getting an `ArgumentError - invalid date` error, but I want to be able to do:

``` ruby
credit_card = MyMoip::CreditCard.new(owner_birthday: '80/01/1990')
if credit_card.valid?
# do something
else
# do something else
end
```