slidez

### Example 3, events

    $bench->add_items( true   => sub{1},
                       false  => sub{0},
                       more   => { code     => sub{sleep($naptime)},
                                   note     => 'taking a nap',
                                   buildup  => sub{$naptime = rand(10)},
                                   teardown => sub{$naptime = 1},
                                 },
                     );