Adding new screenshots

git-svn-id: https://plugins.svn.wordpress.org/ajax-load-more/trunk@964212 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme update

git-svn-id: https://plugins.svn.wordpress.org/ajax-load-more/trunk@964213 b8457f37-d9ea-0310-8a92-e5e31aec5664