language: php

before_script:
  - composer install --dev --prefer-dist

php:
  - 5.3.3
  - 5.3
  - 5.4
  - 5.5

language: php

before_script:
  - composer install --dev --prefer-source

php:
  - 5.3.3
  - 5.3
  - 5.4
  - 5.5

Use --prefer-source instead --prefer-dist for composer packages installation
Use --prefer-source instead --prefer-dist for composer packages installation