* Add SSH support in library.
* GoRTR and RTRdump to use SSH with user/password or without auth
* Updated README with simple compatilibty matrix,
SSH configuration, Cisco configuration.
ASNs are 32-bit unsigned integers. However, `strconv.Atoi` will return
32-bit or 64-bit signed integers depending on the platform. It's best to
use `ParseUint` directly.