Fixed bug in BIC validation

BICValidator allowed invalid BICs which matched the regular expression
but had additional invalid characters padded to the beginning or ending.
Merge pull request #17 from stayhero/master

Fixed bug in BIC validation
Moving specs for Validator into separate file
Validator: Added specs for IBAN and CreditorIdentifier
* Adjusted validation to accept Date.today for credit transfer transactions
show account error details on message validation
Merge pull request #20 from salesking/show_account_errors_on_message

show account error details on message validation
define validator regex as constants, add direct debit transaction class constants
Merge branch 'master' into constantize_validation_regex
update readme examples
Validators: Handle custom attribute names
Merge pull request #21 from salesking/constantize_validation_regex

Use validations in your application models
Added pain.008.001.002 to the list of generated formats