Updated rspec to v3 and replaced rcov with simplecov.

Also used transpec to convert from "should" syntax to preferred "expect" syntax.

Gemfile

@@ -33,9 +33,8 @@ end
 group :test, :development do
   gem 'json', '~> 1.7.7'
   gem 'rake', '>= 0.9.0'
-  gem 'rspec', '>= 2.11.0'
-  gem 'rcov', '>= 0.9.9', :platform => :mri_18
+  gem 'rspec', '~> 3.0'
+  gem 'simplecov', :platforms => [:ruby_19, :ruby_20], :require => false
 end
 
-
-gem 'idn', :platform => :mri_18
+gem 'idn', :platforms => :mri_18