1.2:    1.2.4
2.0:    2.0.0-rc1
2.0.0:  2.0.0-rc1
stable: 1.2.4
dev:    2.0.0-rc1

1.2:    1.2.4
2.0:    2.0.0-rc1
2.0.0:  2.0.0-rc1
stable: 2.0.0-rc1

Make 2.0.0-rc1 the stable version for rubinius.
Make 2.0.0-rc1 the stable version for rubinius.
