Add v6 benchmarking test.

Mostly to exercise the v6 serving path (of which most lies in the
standard library). But it also is a good test of v6 functionality.
Added .travis.yml for Travis-CI
Added travis build status to README.md
Merge pull request #97 from EverythingMe/travis

Added Travis-CI integration
remove empty last line
disable ipv6 test until I know how to check for v6 conn.
Merge branch 'ISSUE-95' of https://github.com/EverythingMe/dns into udp
Cleanup the pull request somewhat
It compiles
Cleanup the PR a bit

Remove code and simplify some functions. Documentation is still on the
todo.
Also don't export any of these functions and/or types.
even shorter