Allow names in the Reply-To header

The Reply-To header now allows a name with the email. 

For example: `Mail::Message.new(to: 'to@email.com', from: 'from@email.com', reply_to: 'Ian Yamey <ian123@email.com>')` now sets the `h:Reply-To` with the full email/name combo. Previously, the header was missing the name.

This PR now sets the header with the correct email, including the name.