committing v1.5

git-svn-id: https://plugins.svn.wordpress.org/simple-photo-gallery/trunk@898809 b8457f37-d9ea-0310-8a92-e5e31aec5664
minor readme update

git-svn-id: https://plugins.svn.wordpress.org/simple-photo-gallery/trunk@898812 b8457f37-d9ea-0310-8a92-e5e31aec5664