Updates for admin css

git-svn-id: https://plugins.svn.wordpress.org/wordtwit/trunk@984339 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated readme

git-svn-id: https://plugins.svn.wordpress.org/wordtwit/trunk@984344 b8457f37-d9ea-0310-8a92-e5e31aec5664