Support commas in names

Bad things happen when an email header has a comma in the name, this fixes that.
Thanks @DASPRiD, can you make sense of what they are doing here: https://github.com/nwellnhof/Email-MIME-RFC2047/blob/master/lib/Email/MIME/RFC2047/AddressList.pm#L29

To me it looks like a simple regex split on a comma, in which case they are not solving the comma in the name problem?