add ability to define geo and map mappings

[rabbitt]

No description provided.

[janorn]

Would be nice if we avoided hardcoded paths. I.e /etc/nginx.

From: params.pp
$nx_conf_dir = $::kernelversion ? {
/(?i-mx:joyent)/ => '/opt/local/etc/nginx',
default => '/etc/nginx',
}

[leepa]

Looks good - please Squash it down to one commit - makes for far cleaner merges.