Option slug should represent plugin name

git-svn-id: https://plugins.svn.wordpress.org/redi-restaurant-reservation/branches/TwoStepReservation@1002429 b8457f37-d9ea-0310-8a92-e5e31aec5664
wordpress use - in option slug

git-svn-id: https://plugins.svn.wordpress.org/redi-restaurant-reservation/branches/TwoStepReservation@1002430 b8457f37-d9ea-0310-8a92-e5e31aec5664