Simplify metadata. Add build:all task

Rakefile

@@ -6,3 +6,12 @@ require File.dirname(__FILE__) + '/lib/radius/version'
 Dir['tasks/**/*.rake'].each { |t| load t }
 
 task :default => :test
+
+namespace :build do
+  desc "Build both Ruby and Java platform gems"
+  task :all do
+    version = ::Radius.version
+    system "gem build radius.gemspec --platform ruby -o radius-#{version}.gem"
+    system "gem build radius.gemspec --platform java -o radius-#{version}-java.gem"
+  end
+end

radius.gemspec

@@ -27,11 +27,8 @@ Gem::Specification.new do |s|
 
   s.metadata = {
     "homepage_uri" => "https://github.com/jlong/radius",
-    "source_code_uri" => "https://github.com/jlong/radius",
     "changelog_uri" => "https://github.com/jlong/radius/blob/master/CHANGELOG",
     "bug_tracker_uri" => "https://github.com/jlong/radius/issues"
   }
-
-  s.platforms = [Gem::Platform::RUBY, 'java']
 end