Shopify/active_merchant — pull request #498 by BlakeMesdag (2012-11-02 19:41:02+00:00)
Title: Make 0000 default post code for everyone if missing

There are only about 70 countries that actually have post codes. [Countries with Post Codes](http://en.wikipedia.org/wiki/List_of_postal_codes)

This extends the previous fix for Ireland to everyone. AVS errors should indicate the post code mismatch if applicable.

## Review

@Soleone @jduff