Add support for parallel_rspec

Rakefile

@@ -5,6 +5,12 @@ RSpec::Core::RakeTask.new(:spec)
 
 task default: :spec
 
+namespace :parallel do
+  task :spec do
+    sh "parallel_rspec spec/"
+  end
+end
+
 task :watch do
   folders_to_watch = 'bin lib spec'
   action_on_change = 'bundle exec rake'
@@ -15,4 +21,4 @@ task :watch do
     puts 'You need to have the filewatcher gem installed to perform this task.'
     puts 'Install with \'gem install filewatcher\''
   end
-end
+end

where_to.gemspec

@@ -24,6 +24,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "simplecov", "~> 0.10.0"
   spec.add_development_dependency "coveralls", "~> 0.8.1"
   spec.add_development_dependency "rspec", "~> 3.2"
+  spec.add_development_dependency "parallel_tests", "~> 1.5.0"
 
   spec.add_dependency "tvdb_party", "~> 0.8.0"
 end