add known IBAN validator#2

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opahk wants to merge 8 commits intomasterfrom

Commits on Oct 18, 2013

add known IBAN validator
Frank C. Eckert
committed

Commits on Oct 22, 2013

update README
Frank C. Eckert
committed

Commits on Oct 29, 2013

add I18n translation
schasse
committed
change translation
schasse
committed
gems confusion
schasse
committed
test multiple gem versions on travis
Frank C. Eckert
committed
make validator work without
Frank C. Eckert
committed

Commits on Nov 6, 2013

Merge pull request #3 from schasse/i18n_validation
Frank C. Eckert
committed