WooCommerce 2.1 fix for order custom fields

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-mailchimp/trunk@863272 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fixed plugin settings link for WooCommerce 2.1

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-mailchimp/trunk@863278 b8457f37-d9ea-0310-8a92-e5e31aec5664
Bug fix for subscribe

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-mailchimp/trunk@863288 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fix for subscribe when not using display_opt_in checkbox.

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-mailchimp/trunk@866514 b8457f37-d9ea-0310-8a92-e5e31aec5664
Recommit of 1.2.5

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-mailchimp/trunk@866520 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added additional debug logging when WP_DEBUG is enabled.

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-mailchimp/trunk@867141 b8457f37-d9ea-0310-8a92-e5e31aec5664