Warnings removed

git-svn-id: https://plugins.svn.wordpress.org/redi-restaurant-reservation/trunk@917247 b8457f37-d9ea-0310-8a92-e5e31aec5664
Merged with trunk

git-svn-id: https://plugins.svn.wordpress.org/redi-restaurant-reservation/branches/LimitReservationFutureTime@920362 b8457f37-d9ea-0310-8a92-e5e31aec5664