title: Is it possible to set up travis to run tests for several languages?
body: <p>I have a rails project and am running tests for my JavaScript test (<a href="http://pivotal.github.io/jasmine/" rel="noreferrer">Jasmine</a>) through <a href="http://karma-runner.github.io" rel="noreferrer">Karma</a></p>
  
  <p>.travis.yml file</p>
  
  <pre><code>language: ruby
  rvm:
    - 2.0.0
  script:
    - RAILS_ENV=test bundle exec rake --trace db:migrate test
    - karma start --single-run --browsers PhantomJS test/karma/config/unit.js
  </code></pre>
  
  <p>Travis fails saying it does not find karma. is there a way to define node_js as another language and install karma on the build VM?</p>