Remove Yardstick

Gemfile

@@ -17,7 +17,6 @@ group :test do
   gem 'rspec', '>= 3'
   gem 'rubocop', '>= 0.37', :platforms => [:ruby_20, :ruby_21, :ruby_22, :ruby_23, :ruby_24]
   gem 'simplecov', '>= 0.9'
-  gem 'yardstick'
 
   platforms :jruby_18, :ruby_18 do
     gem 'mime-types', '~> 1.25'

Rakefile

@@ -28,14 +28,4 @@ rescue LoadError
   end
 end
 
-require 'yardstick/rake/measurement'
-Yardstick::Rake::Measurement.new do |measurement|
-  measurement.output = 'measurement/report.txt'
-end
-
-require 'yardstick/rake/verify'
-Yardstick::Rake::Verify.new do |verify|
-  verify.threshold = 59.1
-end
-
-task :default => [:spec, :rubocop, :verify_measurements]
+task :default => [:spec, :rubocop]