Undefined array key

Hi,

i believe that line 119 in class.wpbenchmarkio.php should go
$bench["executed_description"]=$bench["steps"][$step_group_to_run]["run_tests"][$step_to_run_key]["name"] . ": ".$bench["steps"][$step_group_to_run]["run_tests"][$step_to_run_key]["measured_time"]."ms";

In wp-benchmark-io.php on line 787 we cannot assign $running_benchmark["global_averages"] which is undefined.

Thanks for the plugin! JR