Beta 27.0

• Fixed /is expand erroring when an island argument was not provided
• Fixed /is delete requiring an island argument
• Fixed /is delete not removing players from the island before deletion
• Fixed wilderness flags applying to the default world when configured to use a different world
• Added skyclaims.max-islands option
• Added confirmation dialogs to /is delete
• Added configurable root command alias - the first alias is used for help text