Update Rakefile for verbose RSpec output

Rakefile

@@ -10,7 +10,11 @@ def java?
   !! (RUBY_PLATFORM =~ /java/)
 end
 
-task :default => :test
+def rubinius?
+  !! (RUBY_ENGINE =~ /rbx/)
+end
+
+task :default => :spec
 
 Rake::TestTask.new('test') do |test|
   test.libs << 'lib'
@@ -20,6 +24,8 @@ end
 
 RSpec::Core::RakeTask.new(:spec) do |spec|
   spec.ruby_opts = ['--1.9'] if java?
+  spec.ruby_opts = ['-X19'] if rubinius?
+  spec.rspec_opts = ['-c', '--format d']
   spec.verbose = true
   spec.fail_on_error = true
 end