add 65 countries that do not require postcodes
add 65 countries that do not require postcodes
move [not_]required? methods into main module

also:
* use a set for non-postcode countries for performance
* double quotes everywhere for consistency
* doc new methods
* test new methods
* maintain format_ie_postcode method just incase someone was using it
Merge pull request #11 from sellect/master

Add 65 additional countries that do not require postcodes
bump version to 0.1.5