made extension fail gracefully


git-svn-id: https://plugins.svn.wordpress.org/buyplaytix/trunk@807939 b8457f37-d9ea-0310-8a92-e5e31aec5664
added back in buyplaytix.php


git-svn-id: https://plugins.svn.wordpress.org/buyplaytix/trunk@807941 b8457f37-d9ea-0310-8a92-e5e31aec5664