added -m,--machinereadable, Output results with no headers

added -m,--machinereadable, Output results with no headers
changed interval from int to float

change the time slept to float so 0.5 works
clean up code, try an dlimit to column 80
added -d, --data Output statistics for the tests, min, max, and average (mean)

added -d, --data Output statistics for the tests, min, max, and average
(mean)