language: node_js
node_js:
  - "0.12"
  - "0.11"
  - "0.10"
before_script:
  - npm install -g gulp
script: gulp

language: node_js
node_js:
  - "0.12"
  - "0.11"
  - "0.10"
before_script:
  - npm install -g gulp
  - npm install -g bower
script: gulp

Install bower globally before running gulp script
Install bower globally before running gulp script