Reintegrated Readygraph Features - Modified UI, Fixed SQL Injection

git-svn-id: https://plugins.svn.wordpress.org/email-newsletter/trunk@937426 b8457f37-d9ea-0310-8a92-e5e31aec5664
deleted redundant page

git-svn-id: https://plugins.svn.wordpress.org/email-newsletter/trunk@937428 b8457f37-d9ea-0310-8a92-e5e31aec5664