Rubinius Specs

This PR is the first part of an attempt to get the Rubinius specs green.  The specs now run, but I'm seeing what appears to be a marshalling issue that I'm working to track down.  Gems have been added in an Appraisal friendly way, and the master branch only restriction in the .travis.yml has been removed.

Specs run, but I'm seeing a single failing spec that I'm working to resolve.