Fix: Solves #100

Added a filter that will protect this keyword without having to rename it. I chose this instead of actually renaming the variable because I considered backward-compatibility . And by changing the meta keyword this would required either an update function that renamed all entries that matched 'liveblog' into '_liveblog' or update one by one as needed, but either one could corrupt or mess with the current Liveblog data.

This one seems more clean and avoids any meta keyword renaming hassle.