set compat for WP 3.9

git-svn-id: https://plugins.svn.wordpress.org/heiv-gallery-3/trunk@898027 b8457f37-d9ea-0310-8a92-e5e31aec5664
update num version

git-svn-id: https://plugins.svn.wordpress.org/heiv-gallery-3/trunk@898028 b8457f37-d9ea-0310-8a92-e5e31aec5664