Travis - Add Rails 4.1.0.beta1, Ruby 2.1.0

1. Added Rails 4.1.0.beta1 to Travis
2. Added Ruby 2.1.0 to Travis
3. Added gems required to get Rubinius build running.
4. Enabled supported configurations for Rubinius and JRuby (excluding JRuby / Rails 4.1.0.beta1 because of an ActiveRecord JDBC issue).
5. Added entries to .gitignore
6. Updated 3.2.x and 4.0.x versions of Rails in gem files.