work on wp4 compat

git-svn-id: https://plugins.svn.wordpress.org/nav-query/trunk@955677 b8457f37-d9ea-0310-8a92-e5e31aec5664
add meta class

git-svn-id: https://plugins.svn.wordpress.org/nav-query/trunk@955678 b8457f37-d9ea-0310-8a92-e5e31aec5664
bump version in read me, plugin head

git-svn-id: https://plugins.svn.wordpress.org/nav-query/trunk@955679 b8457f37-d9ea-0310-8a92-e5e31aec5664
bump wp version in readme

git-svn-id: https://plugins.svn.wordpress.org/nav-query/trunk@955680 b8457f37-d9ea-0310-8a92-e5e31aec5664