Add Rubinius and 2.1.0 to Travis config.  Add Rubinius gems to Gemfile.  Remove jruby-openssl from Gemfile and README.  Update JRuby version in README to 1.7.9
Merge pull request #143 from petergoldstein/feature/add_2_1_0_and_rbx

Travis - Add Ruby 2.1.0, Rubinius