Revert "Updates examples to use 'postal_code' over 'zip'"
Revert "Switches tokenizer to send 'postal_code' instead of 'zip'"

This reverts commit 1a50cd0c44fc9af521cf9f9187be5bf28d619b86.
This reverts commit c2e63d060b66af92b9d91e73ae9d5d7e17e2e943.