Removed debug code.

git-svn-id: https://plugins.svn.wordpress.org/email-users/trunk@765983 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fixed implementation of excerpt to use WordPress API allowing filtering.

git-svn-id: https://plugins.svn.wordpress.org/email-users/trunk@765984 b8457f37-d9ea-0310-8a92-e5e31aec5664