BytesType.bytes32PaddedLength() returns incorrect value for lengths greater than 32 and multiples of 32

[junsung-cho]

Issue_title

BytesType.bytes32PaddedLength() returns incorrect value for lengths greater than 32 and multiples of 32.

Issue_description

BytesType::bytes32PaddedLength‎

    @Override
    public int bytes32PaddedLength() {
        return value.length <= 32
                ? MAX_BYTE_LENGTH
                : (value.length / MAX_BYTE_LENGTH + 1) * MAX_BYTE_LENGTH;
    }

In case of the value.length is 64, 96, 128, ...
It should return 64, 96, 128, ...
However, the results are 96, 128, 160, ...

Issue_context

The corrected code is as follows:

    @Override
    public int bytes32PaddedLength() {
        if (value.length < MAX_BYTE_LENGTH) {
            return MAX_BYTE_LENGTH;
        } else if (value.length % MAX_BYTE_LENGTH == 0) {
            return value.length;
        } else {
            return (value.length / MAX_BYTE_LENGTH + 1) * MAX_BYTE_LENGTH;
        }
    }

If it looks fine, I will create a pull request.