Remove rubinius dependencies from gemspec, add to Gemfile.

Author: gkellogg

.gemspec

@@ -38,15 +38,5 @@ Gem::Specification.new do |gem|
   gem.add_development_dependency 'rdf-isomorphic'
   gem.add_development_dependency 'rdf-xsd'
 
-  # Rubinius has it's own dependencies
-  if RUBY_ENGINE == "rbx" && RUBY_VERSION >= "2.1.0"
-    #gem.add_runtime_dependency     "rubysl-bigdecimal"
-    gem.add_development_dependency "rubysl-base64"
-    gem.add_development_dependency "rubysl-open-uri"
-    gem.add_development_dependency "rubysl-prettyprint"
-    gem.add_development_dependency "rubysl-rexml"
-    gem.add_development_dependency "racc"
-  end
-
   gem.post_install_message  = nil
 end

.travis.yml

@@ -8,3 +8,4 @@ rvm:
   - 2.0.0
   - jruby-19mode
   - rbx
+cache: bundler

Gemfile

@@ -14,3 +14,8 @@ group :debug do
   gem "wirble"
   gem "debugger", :platforms => [:mri_19, :mri_20]
 end
+
+platforms :rbx do
+  gem 'rubysl', '~> 2.0'
+  gem 'rubinius', '~> 2.0'
+end

lib/json/ld.rb

@@ -1,6 +1,5 @@
 $:.unshift(File.expand_path(File.join(File.dirname(__FILE__), '..')))
 require 'rdf' # @see http://rubygems.org/gems/rdf
-require 'backports' if RUBY_VERSION < "1.9"
 
 module JSON
   ##