Fix `STPAddressViewModel.isValid` to use country when `requiredBillingFields = .Zip`#853

Merged

danj-stripe merged 3 commits intomasterfrom danj/bugfix/840-optional-zip

Dec 12, 2017

+38-4

Commits on Dec 12, 2017

Add failing test in STPAddressViewModelTest to capture #840
danj-stripe
committed
Add addressFieldTableViewCountryCode to the STPAddress created by STPAddressViewModel
danj-stripe
committed
Hide inputAccessoryToolbar when there is no postal code for the current country
danj-stripe
committed