Support for PHP 5.3, SK bank code validation and throwing validation exceptions

[mbartok]

Added validation of Slovak bank codes
Added support for php 5.3
Added dependency on php 5.3 to composer.json

[bazo]

why would i want to support php 5.3? this version is dead

[mbartok]

PHP 5.3 is still latest stable version on many obsolete hosting servers (unfortunately in my case) or is simply required due some backward compatibility in old applications. I don't thing that replacing array() to [] will somehow make code better or faster or more stable.

Also i've just commited major change to generate() method - throwing validation exception. It was too bad, that user couldn't be notified, why there was a problem by generating iban. Now the code is more reusable, you just have to add a try-catch block on generate() call.

[bazo]

and why did you change the coding standard? now the pull request is a big mess with hard to track changes

[bazo]

and php 5.3 needs to die. change your hosting. even websupport supports at least 5.5

[mbartok]

I totally agree that php 5.3 needs to die but i have a important client and i simply cannot dictate these things. So what if your lib would be little bit more backward compatible? I didn't add any deprecated code.

Sorry for those indentations - i've used auto code formatting.