Log file to accompany CSV file

[ghost]

When you use the -c or --csv option, I think it would be useful to also output an accompanying log file to tell you when you ran the test, and what options were used.
An example log file might look like this:

PONG Ran 2013-4-30 14:02GMT
srcIP: 20.20.20.20
command: sudo ./pong.out google.com 8.8.8.8 -n 10 --request-time 500
10 pings sent, 1 ping dropped