*Add support for SSH port

Add a port option the resource
I don't like having this default to `-o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no`

I'd rather see something with a $ssh_options parameter added, undef by default, that can take an array
```puppet
if $port {
  if $ssh_options {
    validate_array($ssh_options)
    $mySshOptions = join(prefix($ssh_options, ' -o '), '')
  }
  $myPort = "-e \"ssh -p ${port}${mySshOptions}\""
```

Also, see #37 for why this should by $myPort instead of $MyPort.