Quick reference for Travis CI yaml configuration. See official documentation.

## Reference

### Node.js

    language: node_js
    node_js:
      - '4'

Defaults install to `npm install`, and defaults test to `npm test`.

### Ruby

    language: ruby
    rvm:
      - 2.0.0
      - 1.9.3
      - 1.8.7

Defaults install to `bundle install`, defaults test to `rake`.

### Build lifecycle

Lifecycle
`before_install`
`install`
`before_script`
`script`
`after_success` or `after_failure`
`after_script`
`before_deploy` (optional)
`deploy` (optional)
`after_deploy` (optional)

### Branches

    branches:
      except: ['..']
      only: ['master']

### Environment vars

    env:
      - 'rack=master'
      - 'rack=1.3.4'

### Custom test command

    script: make test
    before_script: make pretest
    after_script:  make clean

    before_script:
      - make pretest1
      - make pretest2

### Branches

    branches:
      except:
        - legacy

      only:
        - gh-pages
        - /^deploy/

### Apt packages

    before_install:
      - sudo apt-get update -q
      - sudo apt-get install gcc-4.8 -y

https://docs.travis-ci.com/user/installing-dependencies/

### Etc

    gemfile:
      - gemfiles/Gemfile.rails-2.3.x
      - gemfiles/Gemfile.rails-3.0.x

### References

- http://about.travis-ci.org/docs/user/build-configuration/
- http://about.travis-ci.org/docs/user/languages/javascript-with-nodejs/
- http://about.travis-ci.org/docs/user/languages/ruby/

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