Features/prodsupp 1178

* disable exception on invalid transaction and add invalid transactions in separate list (show invalid MIDs from settlement_engine)
* change identification label to SUMUP
* remove BIC validation for Poland and Switzerland
* update tests
Same is in forked sepa_king
https://github.com/salesking/sepa_king/blob/master/lib/sepa_king/transaction/credit_transfer_transaction.rb