Cast entities values assignments

[beroso]

The parser are storing SimpleXML elements in the entities properties.
I think, for example, the code from Parser::buildCreditAccount:

....
$bankAccount->accountNumber = $statementResponse->BANKACCTFROM->ACCTID;
$bankAccount->routingNumber = $statementResponse->BANKACCTFROM->BANKID;
$bankAccount->accountType = $statementResponse->BANKACCTFROM->ACCTTYPE;
....

should be:

....
$bankAccount->accountNumber = (string)$statementResponse->BANKACCTFROM->ACCTID;
$bankAccount->routingNumber = (string)$statementResponse->BANKACCTFROM->BANKID;
$bankAccount->accountType = (string)$statementResponse->BANKACCTFROM->ACCTTYPE;
....