New feature -- Added attach via pipe.

[rmasci]

Added the following code to message.go. This adds the ability for the user to send email from the command line of a server using a pipe. This is very useful when sending yourself and / or others a chunk from a log file.

tail -100 SomeLogfile.log | goemailprog -t [email protected] -s "logfile" -m "last 100 from SomeLogfile" -p "SomeLogfile.log"

---- code to add to messages.go ---

func (m *Message) pipeFile(list []*file, name string) []*file {
f := &file{
Name: name,
Header: make(map[string][]string),
CopyFunc: func(w io.Writer) error {
h := bufio.NewReader(os.Stdin)
if _, err := io.Copy(w, h); err != nil {
return err
}
return nil
},
}

if list == nil {
	return []*file{f}
}

return append(list, f)

}

// Pipe attaches the files to the email, user pipes it in from stdin.
func (m *Message) Pipe(filename string, settings ...FileSetting) {
m.attachments = m.pipeFile(m.attachments, filename)
}

[pedromorgan]

See #108