Updated various code snippets for readability

git-svn-id: https://plugins.svn.wordpress.org/event-calendar-ticketing/trunk@773722 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added sanity checks to protect against direct file loading

git-svn-id: https://plugins.svn.wordpress.org/event-calendar-ticketing/trunk@773723 b8457f37-d9ea-0310-8a92-e5e31aec5664