Switch to i18napis.appspot.com for postal codes.

[archseer]

CLDR v27 deprecated the postal code file: http://unicode.org/reports/tr35/tr35-info.html#Postal_Code_Validation

[camertron]

Awesome, thanks for the heads-up @archseer. It shouldn't be too difficult to switch to the new source. I'll see what I can do.

[camertron]

See #167