removing visibility.js because buggy

git-svn-id: https://plugins.svn.wordpress.org/smart-image-loader/trunk@1002555 b8457f37-d9ea-0310-8a92-e5e31aec5664
tagging 0.3.2

git-svn-id: https://plugins.svn.wordpress.org/smart-image-loader/trunk@1002557 b8457f37-d9ea-0310-8a92-e5e31aec5664