Add RuboCop, start configuration, add --auto-gen-config (#851)

.rubocop.yml

@@ -0,0 +1,13 @@
+inherit_from: .rubocop_todo.yml
+
+AllCops:
+  DisplayCopNames: true
+  DisplayStyleGuide: true
+  TargetRubyVersion: 2.3
+
+Naming/MethodName:
+  Exclude:
+    - test/adapters/integration.rb
+    - test/adapters/rack_test.rb
+
+

Gemfile

@@ -23,6 +23,7 @@ group :test do
   gem 'patron', '>= 0.4.2', :platforms => :ruby
   gem 'rack-test', '>= 0.6', :require => 'rack/test'
   gem 'rest-client', '~> 1.6.0', :platforms => [:jruby, :ruby_18]
+  gem 'rubocop', '~> 0.65.0'
   gem 'simplecov'
   gem 'sinatra', '~> 1.3'
   gem 'typhoeus', '~> 1.3', :git => 'https://github.com/typhoeus/typhoeus.git', :require => 'typhoeus'
@@ -31,3 +32,4 @@ group :test do
 end
 
 gemspec
+

lib/faraday/utils.rb

@@ -49,7 +49,7 @@ module Faraday
     # url - A String or URI.
     #
     # Returns a parsed URI.
-    def URI(url)
+    def URI(url) # rubocop:disable Naming/MethodName
       if url.respond_to?(:host)
         url
       elsif url.respond_to?(:to_str)