thrown the right exception when a not valid object is passed to set method; some docblocks have been fixed
thrown the right exception when a not valid object is passed to set method; some docblocks have been fixed

redkite-labs/RedKiteCmsBundle,redkite-labs/RedKiteCmsBundle,redkite-labs/RedKiteCmsBundle,redkite-labs/RedKiteCmsBundle,redkite-labs/RedKiteCmsBundle