Added Disk menu item.
Added Disk menu item.

Did not connect the Eject/Mount/Unmount menu to the table view or a cell within the table view because the click may occur on a row other than the selected disk, which is what the code acts on.
aburgh/Disk-Arbitrator,aburgh/Disk-Arbitrator,aburgh/Disk-Arbitrator,aburgh/Disk-Arbitrator