More files for git to ignore
Add support for setting TTL's on ICMP pings.  Based on a patch from
rolek@bokxing.nl.

TODO: the tests included (thanks very much!) are Test based instead of
Test::More so probably need a bit more cleanup.  The current no_plan
is temporary.
Add new test to the MANIFEST
The Test::skip was not working in a Test::More world in the new
TTL tests.  Updated it a bit to pass.  More cleanup is likely needed.