Merge pull request #125 from jvdvleuten/master

Added correct parsing when the filename or name of an attachment is embedded in the Content-Type header.
bump version to 1.7.2
Renamed GetAddresses to GetMailAddresses.
Made sure that GetMailAddresses finds correct addresses when the DisplayName part contains a comma.
Removed looking for semicolon as I cannot find this in the mail spec and don't have any example mail headers containing semicolons to separate mail addresses.