Tagging version 1.8.0

git-svn-id: https://plugins.svn.wordpress.org/memberful-wp/trunk@923857 b8457f37-d9ea-0310-8a92-e5e31aec5664
Tagging version 1.8.1

git-svn-id: https://plugins.svn.wordpress.org/memberful-wp/trunk@923863 b8457f37-d9ea-0310-8a92-e5e31aec5664