WP 4 tested and version up

git-svn-id: https://plugins.svn.wordpress.org/wp-simple-mail-sender/trunk@987318 b8457f37-d9ea-0310-8a92-e5e31aec5664
Tag Up

git-svn-id: https://plugins.svn.wordpress.org/wp-simple-mail-sender/trunk@987319 b8457f37-d9ea-0310-8a92-e5e31aec5664