Bundled C core with Ruby library
diff --git a/Rakefile b/Rakefile
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+# -*- ruby -*-
+require 'rake/extensiontask'
+require 'rspec/core/rake_task'
+require 'rubocop/rake_task'
+require 'bundler/gem_tasks'
+
+# Add rubocop style checking tasks
+RuboCop::RakeTask.new(:rubocop) do |task|
+  task.options = ['-c', 'src/ruby/.rubocop.yml']
+  task.patterns = ['src/ruby/{lib,spec}/**/*.rb']
+end
+
+# Add the extension compiler task
+Rake::ExtensionTask.new 'grpc' do |ext|
+  ext.source_pattern = '**/*.{c,h}'
+  ext.ext_dir = File.join('src', 'ruby', 'ext', 'grpc')
+  ext.lib_dir = File.join('src', 'ruby', 'lib', 'grpc')
+end
+
+# Define the test suites
+SPEC_SUITES = [
+  { id: :wrapper, title: 'wrapper layer', files: %w(src/ruby/spec/*.rb) },
+  { id: :idiomatic, title: 'idiomatic layer', dir: %w(src/ruby/spec/generic),
+    tags: ['~bidi', '~server'] },
+  { id: :bidi, title: 'bidi tests', dir: %w(src/ruby/spec/generic),
+    tag: 'bidi' },
+  { id: :server, title: 'rpc server thread tests', dir: %w(src/ruby/spec/generic),
+    tag: 'server' },
+  { id: :pb, title: 'protobuf service tests', dir: %w(src/ruby/spec/pb) }
+]
+namespace :suite do
+  SPEC_SUITES.each do |suite|
+    desc "Run all specs in the #{suite[:title]} spec suite"
+    RSpec::Core::RakeTask.new(suite[:id]) do |t|
+      ENV['COVERAGE_NAME'] = suite[:id].to_s
+      spec_files = []
+      suite[:files].each { |f| spec_files += Dir[f] } if suite[:files]
+
+      if suite[:dir]
+        suite[:dir].each { |f| spec_files += Dir["#{f}/**/*_spec.rb"] }
+      end
+      helper = 'src/ruby/spec/spec_helper.rb'
+      spec_files << helper unless spec_files.include?(helper)
+
+      t.pattern = spec_files
+      t.rspec_opts = "--tag #{suite[:tag]}" if suite[:tag]
+      if suite[:tags]
+        t.rspec_opts = suite[:tags].map { |x| "--tag #{x}" }.join(' ')
+      end
+    end
+  end
+end
+
+# Define dependencies between the suites.
+task 'suite:wrapper' => [:compile, :rubocop]
+task 'suite:idiomatic' => 'suite:wrapper'
+task 'suite:bidi' => 'suite:wrapper'
+task 'suite:server' => 'suite:wrapper'
+task 'suite:pb' => 'suite:server'
+
+desc 'Compiles the gRPC extension then runs all the tests'
+task all: ['suite:idiomatic', 'suite:bidi', 'suite:pb', 'suite:server']
+task default: :all