language: ruby
rvm:
  - 1.8.7
  - 1.9.2
  - 1.9.3
  - 2.0
  - 2.1
  - 2.2
  - jruby-1.7
  - rbx-2.2
  - rbx-2.4

language: ruby
rvm:
  - 1.8.7
  - 1.9.2
  - 1.9.3
  - 2.0
  - 2.1
  - 2.2
  - jruby-1.7
  - rbx-2

Build against Rubinius 2 to fix build error
Build against Rubinius 2 to fix build error

Building against rbx-2.4 gives the following error on Travis CI:

> Gemset '' does not exist, 'rvm rbx-2.4 do rvm gemset create ' first,
> or append '--create'.

Avoid this by using a less specific Rubinius version.
