Add support for specifying interface config param.
Update GEMSPEC
Fix gemspec for build, add packetfu depend
Fix source_address=
Fix valid?
Added send_raw_tcp and send_raw_udp

Not yet perfect, but seems to do the job.
Update changelog, create TODO
Merge branch 'post_fork_bugfixes'

This branch adds actual raw support for spoofing source addresses
to Net::DNS::Resolver and fixes a couple issues found along the way.
Also moves Gemspec/changelog to new authorship.