Found 2 errors in the 7.x.-2.x-dev version

Hi there,

I think I found 2 errors in the following files (version 7.x-2.x-dev). They were causing errors and warnings when trying to alter the subdomain configurations and saving new nodes.

includes/subdomain.admin.inc line 221:
if ($form_state['values']['subdomain_mode'] != $form['subdomain_mode']['#default_value']) {
seems like it should be:
if ($form_state['values']['subdomain_mode'] != $form['mode']['subdomain_mode']['#default_value']) {

and includes/subdomain.inc line 102:
$subdomain = subdomain_get_subdomain($object['uid']);
seems like it should be:
$subdomain = subdomain_get_subdomain($object->uid);

Thanks for your work in this module. It's very useful to us (http://culturaperu.org).

rodrigo