updated icon assets for wp4.0

git-svn-id: https://plugins.svn.wordpress.org/anual-archive/trunk@990870 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated version on php file

git-svn-id: https://plugins.svn.wordpress.org/anual-archive/trunk@990874 b8457f37-d9ea-0310-8a92-e5e31aec5664