v1.7 update w/ WP 3.8 support

git-svn-id: https://plugins.svn.wordpress.org/wp-update-notification/trunk@820239 b8457f37-d9ea-0310-8a92-e5e31aec5664
v1.7 update w/ WP 3.8 support

git-svn-id: https://plugins.svn.wordpress.org/wp-update-notification/trunk@820244 b8457f37-d9ea-0310-8a92-e5e31aec5664