Fix some details

git-svn-id: https://plugins.svn.wordpress.org/mailin/trunk@962427 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fix readme.txt

git-svn-id: https://plugins.svn.wordpress.org/mailin/trunk@962428 b8457f37-d9ea-0310-8a92-e5e31aec5664