twitter authentication

git-svn-id: https://plugins.svn.wordpress.org/users-ultra/trunk@919117 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated readme.txt

git-svn-id: https://plugins.svn.wordpress.org/users-ultra/trunk@919119 b8457f37-d9ea-0310-8a92-e5e31aec5664