add ruby 2.1.1 to travis-ci
this serverspec version does not work w/ rspec-3.0
Merge pull request #368 from tacahilo/add-ruby2.1.1-to-travisci

add ruby 2.1.1 to travis-ci
Merge pull request #370 from tagomoris/rspec-2.x

this serverspec version does not work w/ rspec-3.0
Bump up version