Updating Screenshots

git-svn-id: https://plugins.svn.wordpress.org/ym-twitter-feed/trunk@1004282 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updating Screenshots and links

git-svn-id: https://plugins.svn.wordpress.org/ym-twitter-feed/trunk@1004284 b8457f37-d9ea-0310-8a92-e5e31aec5664