Update US.class.php

Added regional zip codes for the following states: AL, AK, AZ, AR, CA
Update Canada.class.php

Added regional postal codes for all of Canada.
Update PostalZip.class.php

Added support for regional postal/zip codes.
Update CountryPlugin.abstract.class.php

Added support for regional postal/zip codes.
Merge pull request #108 from twindual/master

Update for regional postal/zip code support.