Revert "Test against Rubinius 2.0"
Revert "Test against Rubinius 2.0"

This reverts commit 8d4ee842f419d83e49559024e41c150767033530.

flores/travis-ci,fxposter/travis-ci,fxposter/travis-ci,openeducation/travis-ci,fxposter/travis-ci,openeducation/travis-ci,flores/travis-ci,flores/travis-ci,openeducation/travis-ci