turned HTMLBody into a bytes.Buffer to use it as a Writer for html/template
Merge remote-tracking branch 'cryptix/bufferBodies' into feature/buffer-bodies
body is also a bytes buffer
alternate way of setting body / htmlbody in test
store all addresses as actual mail.Address instead of plain strings

moved parsing to when addresses are set on the message rather than during
message content creation.
gutted out SendMail so it uses message.SendMailArgs

SendMail previously re-implemented all the logic held in net/smtp.SendMail. This
change finalizes the move away from that code repetition and now completely
leverages SendMail; keeping all of the packaging logic within the message method
SendMailArgs.
docs for golint
variable name for golint
Merge branch 'feature/mail-addresses' into feature/sendmail-arguments
dropped implicit else statements
Merge branch 'feature/mail-addresses' into feature/sendmail-arguments
Merge branch 'feature/buffer-bodies'
Merge branch 'feature/sendmail-arguments'

Conflicts:
	main_test.go
	smtp.go