slight tweak to core code

git-svn-id: https://plugins.svn.wordpress.org/social-gallery-lite/trunk@806408 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated readme

git-svn-id: https://plugins.svn.wordpress.org/social-gallery-lite/trunk@806409 b8457f37-d9ea-0310-8a92-e5e31aec5664