Added field for custom domain

git-svn-id: https://plugins.svn.wordpress.org/nextclick-page-recommendations/trunk@778408 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added field for custom domain

git-svn-id: https://plugins.svn.wordpress.org/nextclick-page-recommendations/trunk@778410 b8457f37-d9ea-0310-8a92-e5e31aec5664