allow a destination string like "logs4.papertrail.app:12345"

[ecc1]

A simple auxiliary function:
func Destination(hostColonPort string, network string) *Writer
would be useful, in case papertrail ever adds new domain names, and because that's how the papertrail website refers to destinations.

[ecc1]

A String() method on *papertrail.Writer that returns the "logsN.papertrailapp.comm:12345" string would also be useful.

[chuckhacker]

+1

I plan on using LogDNA instead of Papertrail (also uses rsyslogd), and this would be helpful.