Added General Settings > Student Interface > Hide Leaderboard from Students checkbox.

Note: This will appear under the Leaderboard Options fieldset.

This option will allow the Admin(s) to hide the leader board from the Navigation Menu.

The Leaderboard can still be accessed through the direct link if the link is known.

Added General Settings > General Administration > Hide Badges from Students

Note: This will be hidden if the Activate User Badges option is off.

This option will allow the Admin(s) to hide the badges column from the Students on the Leaderboard.