message: adding xvfb display for Firefox
diff: @@ -14,6 +14,9 @@ before_script:
  - npm install
  - git config --global user.email "travis@travis-ci.org"
  - git config --global user.name "Travis CI"
  +- "export DISPLAY=:99.0"
  +- "sh -e /etc/init.d/xvfb start"
  +- sleep 3 # give xvfb some time to start
  script: gulp travis-test
  after_success:
  - sh success.sh
  