rvm:
  - 1.8.7
  - 1.9.3
  - jruby
  - rbx
  - 2.0.0
  - 2.1.0
  - ruby-head
env:
  - CHILDPROCESS_POSIX_SPAWN=true
  - CHILDPROCESS_POSIX_SPAWN=false
matrix:
  allow_failures:
    - rvm: jruby
      env: CHILDPROCESS_POSIX_SPAWN=true
    - rvm: rbx
      env: CHILDPROCESS_POSIX_SPAWN=true
    - rvm: ruby-head

rvm:
  - 1.9.3
  - jruby
  - rbx
  - 2.0.0
  - 2.1.0
  - ruby-head
env:
  - CHILDPROCESS_POSIX_SPAWN=true
  - CHILDPROCESS_POSIX_SPAWN=false
matrix:
  allow_failures:
    - rvm: jruby
      env: CHILDPROCESS_POSIX_SPAWN=true
    - rvm: rbx
      env: CHILDPROCESS_POSIX_SPAWN=true
    - rvm: ruby-head

Remove 1.8.7 from the build
Remove 1.8.7 from the build

Travis seems unable to bundle on 1.8.7: https://travis-ci.org/jarib/childprocess/jobs/16260213
