Fixed problem with User Access Manager integration sending to all users.

git-svn-id: https://plugins.svn.wordpress.org/email-users/trunk@883685 b8457f37-d9ea-0310-8a92-e5e31aec5664
Prep for 4.6.7 release.

git-svn-id: https://plugins.svn.wordpress.org/email-users/trunk@883686 b8457f37-d9ea-0310-8a92-e5e31aec5664