language: node_js
node_js:
    - "4.4"
    - "4.3"
before_install:
    - "export DISPLAY=:99.0"
    - "sh -e /etc/init.d/xvfb start"

language: node_js
node_js:
    - "4.4"
    - "4.3"
before_install:
    - "export DISPLAY=:99.0"
    - "sh -e /etc/init.d/xvfb start"
    - "npm install -g npm@3"

Add step to upgrade npm in Travis
Add step to upgrade npm in Travis
