release 4.0.0

git-svn-id: https://plugins.svn.wordpress.org/smsify/trunk@841210 b8457f37-d9ea-0310-8a92-e5e31aec5664
update app version 

git-svn-id: https://plugins.svn.wordpress.org/smsify/trunk@841211 b8457f37-d9ea-0310-8a92-e5e31aec5664