Remove warning in tests.
Remove old stuff from Travis build.
Use the new build env on Travis

more capacity, more ram, dedicated cpu, better networking

also changed ruby 2.1 to test against the latest version
Merge pull request #483 from joshk/patch-1

Use the new build env on Travis
Use pure ruby to send a TCP message
Merge pull request #484 from badboy/travis-test

Use pure ruby to send a TCP message
Merge remote-tracking branch 'origin/master' into sentinel