Revert "Test against Rubinius in both Ruby 1.8 and 1.9 mode"
Revert "Test against Rubinius in both Ruby 1.8 and 1.9 mode"

This reverts commit a7cd4c25737f9c49d5559ae658640154617e83c6.

rubygems/rubygems.org-backup,rubygems/rubygems.org-backup,dstrctrng/private_event,1337807/rubygems.org,square/rubygems.org,square/rubygems.org,square/rubygems.org,dstrctrng/private_event,1337807/rubygems.org,1337807/rubygems.org,rubygems/rubygems.org-backup