rvm:
  - 1.8.7
  - 1.9.2
  - ree
  - ruby-head
  - rbx
  - rbx-2.0
  
rvm:
  - 1.8.7
  - 1.9.2
  - ree
  - ruby-head
  - rbx
  - rbx-2.0
  - jruby

Test against 'jruby' once again.
[ci]: Test against 'jruby' once again.