added library / extension / input-type  for iban validation
changed iban input type validation
added headline in changes file
removed unused variable, added new build
merged with develop
added vat number validation
updated changelog
corrected typo
merged with develop
added new build
Merge pull request #539 from sulu-cmf/feature/iban-validation

[ENHANCEMENT] added library / extension / input-type  for iban validation