title: In Travis CI, can I run a script after all of my build matrix has succeeded?
body: <p>I'm using Travis CI to build my Python project.  I'd like to test my project against different versions of Python, but then have a script that runs only if all of them are successful.</p>
  
  <p>For example, this travis.yml doesn't do the job, since the after_success part runs after each of the Python builds:</p>
  
  <pre><code>language: python
  python:
    - '2.7'
    - '3.2'
  script:
    - python setup.py test
  after_success:
    - # this runs both on 2.7 and 3.2
  </code></pre>
  
  <p>Is there any way to do this?</p>