sudo: false
language: ruby
rvm:
    - 1.9.2
    - 1.9.3
    - 2.0
    - 2.1
    - 2.2
script: bundle exec rake

sudo: false
cache: bundler
language: ruby
rvm:
    - 1.9.2
    - 1.9.3
    - 2.0
    - 2.1
    - 2.2

Use bundler cache on Travis CI
Use bundler cache on Travis CI