rvm:
  - 1.8.7
  - 1.9.2
  - 1.9.3
  - 2.0.0
  - ree
  - jruby
  - rbx

rvm:
  - 1.8.7
  - 1.9.2
  - 1.9.3
  - 2.0.0
  - ree
  - jruby
  - rbx-2.0

Use rbx-2.0 instead of rbx that is raising error on Travis
Use rbx-2.0 instead of rbx that is raising error on Travis