travis: don't run tests written by Ruby
travis: don't run tests written by Ruby

naoa/groonga,komainu8/groonga,hiroyuki-sato/groonga,redfigure/groonga,komainu8/groonga,groonga/groonga,groonga/groonga,cosmo0920/groonga,groonga/groonga,cosmo0920/groonga,kenhys/groonga,hiroyuki-sato/groonga,redfigure/groonga,kenhys/groonga,myokoym/groonga,naoa/groonga,myokoym/groonga,groonga/groonga,komainu8/groonga,naoa/groonga,kenhys/groonga,kenhys/groonga,redfigure/groonga,redfigure/groonga,kenhys/groonga,myokoym/groonga,redfigure/groonga,hiroyuki-sato/groonga,cosmo0920/groonga,hiroyuki-sato/groonga,cosmo0920/groonga,naoa/groonga,myokoym/groonga,hiroyuki-sato/groonga,groonga/groonga,komainu8/groonga,groonga/groonga,naoa/groonga,myokoym/groonga,hiroyuki-sato/groonga,cosmo0920/groonga,redfigure/groonga,myokoym/groonga,kenhys/groonga,redfigure/groonga,naoa/groonga,myokoym/groonga,redfigure/groonga,cosmo0920/groonga,kenhys/groonga,cosmo0920/groonga,komainu8/groonga,komainu8/groonga,naoa/groonga,groonga/groonga,naoa/groonga,komainu8/groonga,hiroyuki-sato/groonga,groonga/groonga,kenhys/groonga,cosmo0920/groonga,komainu8/groonga,hiroyuki-sato/groonga,myokoym/groonga