generating valid IBAN for every currently known locale that uses it

Also added an util to extract IBAN format from SWIFT site data.

There are two things that concern me:
1. How to mention this in the readme.md? The default en_US locale doesn't use IBAN.
2. Adding lots of  new Company.php files with only one method make those locale not use the en_US version, which got some slick bs and cathPhrase methods. I don't know if it's an issue or concern, but IMHO it looks way better than the base Company provider.