Install PhantomJS 2 for TravisCI

.travis.yml

---
language: node_js
node_js:
  - "0.12"

sudo: false

cache:
  directories:
    - node_modules

# https://github.com/travis-ci/travis-ci/issues/3225
# Explicitly use PhantomJS 2.0 from image
before_install:
  - mkdir -p travis-phantomjs
  - wget https://s3.amazonaws.com/travis-phantomjs/phantomjs-2.0.0-ubuntu-12.04.tar.bz2 -O $PWD/travis-phantomjs/phantomjs-2.0.0-ubuntu-12.04.tar.bz2
  - tar -xvf $PWD/travis-phantomjs/phantomjs-2.0.0-ubuntu-12.04.tar.bz2 -C $PWD/travis-phantomjs
  - export PATH=$PWD/travis-phantomjs:$PATH
  - "npm config set spin false"
  - "npm install -g npm@^2"

install:
  - npm install -g bower
  - npm install
  - bower install

script:
  - npm test