rvm:
  - 1.8.7
  - 1.9.2
  - 1.9.3  
  - ruby-head
  - ree
  - rbx

rvm:
  - 1.8.7
  - 1.9.2
  - 1.9.3
  - ree

Disable some interpreters in the Travis config.
Disable some interpreters in the Travis config.