Add a test for the {setuid,false} option
Merge branch 'master' of github.com:msantos/gen_icmp
Return posix error from init/1

Instead of crashing, return errno from init. Since open is a wrapper
around start_link, the calling process will crash too.
Correct documented reply for ping/1,2,3

The last element of the reply should be a 2-tuple, not a 4-tuple. Thanks
MononcQc!
Clarify the units for the elapsed time

Thanks again, MononcQc!
Fix accidental variable match
Update rebar URL
Merge github.com:msantos/gen_icmp