add tag and edit description

git-svn-id: https://plugins.svn.wordpress.org/gallery-images/trunk@1051509 b8457f37-d9ea-0310-8a92-e5e31aec5664
add tag

git-svn-id: https://plugins.svn.wordpress.org/gallery-images/trunk@1051510 b8457f37-d9ea-0310-8a92-e5e31aec5664