bad option to /bin/ping

[mesheldrake]

The "-o" option to ping in ping.js seems to be a typo. Like, the wrong type of o.
Should be capital "-O".
When I run /bin/ping at the command line with small -o, it fails with an error message.
I assume, then, that the spawned ping for linux and maybe mac in ping.js has also been failing.
Couldn't figure out the build enviroment to test myself though.