Support RBX >= 2.1.0.

Author: gkellogg

.gemspec

@@ -28,7 +28,6 @@ Gem::Specification.new do |gem|
   gem.required_ruby_version = '>= 1.9.2'
   gem.requirements          = []
   gem.add_runtime_dependency     'rdf',             '>= 1.0.8'
-  gem.add_runtime_dependency     'json',            '>= 1.7.5'
   gem.add_development_dependency 'equivalent-xml' , '>= 0.2.8'
   gem.add_development_dependency 'open-uri-cached', '>= 0.0.5'
   gem.add_development_dependency 'yard' ,           '>= 0.8.3'
@@ -38,5 +37,16 @@ Gem::Specification.new do |gem|
   gem.add_development_dependency 'rdf-trig',        '>= 1.0.1'
   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

@@ -7,4 +7,4 @@ rvm:
   - 1.9.3
   - 2.0.0
   - jruby-19mode
-  - rbx-19mode
+  - rbx