Update zipCode.js

zipCode validator should default to a non-empty test instead of testing all unsupported countries against the US zipcode format.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	src/js/validator/zipCode.js
adding support for South African VAT number validation
Add content-type header
Merge pull request #609 from etorres/master

Add content-type header for demo/remote.php
#609: Add content-type header for demo/remote.php, thanks to @etorres
Merge pull request #519 from evilchili/master

Add validator for South African VAT numbers
#519: Add validator for South African VAT numbers, thanks to @evilchili
#519: Add validator for South African VAT numbers, thanks to @evilchili