add rubocop

.rubocop.yml

@@ -0,0 +1,18 @@
+# This is the configuration used to check the rubocop source code.
+
+Style/Encoding:
+  Enabled: true
+
+Metrics/LineLength:
+  Enabled: false
+
+require: rubocop-rspec
+
+RSpec/FilePath:
+  Enabled: false
+
+Performance/RedundantMatch:
+  Enabled: false
+
+AllCops:
+  TargetRubyVersion: 1.9

Gemfile

@@ -9,3 +9,8 @@ group :test do
   gem 'rspec-instafail'
   gem 'pry'
 end
+
+group :development do
+  gem 'rubocop'
+  gem 'rubocop-rspec'
+end

Gemfile.lock

@@ -7,13 +7,18 @@ GIT
 GEM
   remote: https://rubygems.org/
   specs:
+    ast (2.2.0)
     coderay (1.1.0)
     diff-lcs (1.2.5)
     method_source (0.8.2)
+    parser (2.3.0.4)
+      ast (~> 2.2)
+    powerpack (0.1.1)
     pry (0.10.1)
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
+    rainbow (2.1.0)
     rspec (3.2.0)
       rspec-core (~> 3.2.0)
       rspec-expectations (~> 3.2.0)
@@ -29,7 +34,16 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.2.0)
     rspec-support (3.2.2)
+    rubocop (0.37.1)
+      parser (>= 2.3.0.4, < 3.0)
+      powerpack (~> 0.1)
+      rainbow (>= 1.99.1, < 3.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (~> 0.3)
+    rubocop-rspec (1.3.1)
+    ruby-progressbar (1.7.5)
     slop (3.6.0)
+    unicode-display_width (0.3.1)
 
 PLATFORMS
   ruby
@@ -39,6 +53,8 @@ DEPENDENCIES
   pry
   rspec
   rspec-instafail
+  rubocop
+  rubocop-rspec
 
 BUNDLED WITH
    1.10.6