add Rubocop

.rubocop.yml

@@ -0,0 +1 @@
+inherit_from: .rubocop_todo.yml

.rubocop_todo.yml

@@ -0,0 +1,51 @@
+# This configuration was generated by `rubocop --auto-gen-config`
+# on 2014-12-20 01:31:10 +0100 using RuboCop version 0.26.1.
+# The point is for the user to remove these configuration records
+# one by one as the offenses are removed from the code base.
+# Note that changes in the inspected code, or installation of new
+# versions of RuboCop, may require this file to be generated again.
+
+# Offense count: 3
+Lint/HandleExceptions:
+  Enabled: false
+
+# Offense count: 1
+Lint/UnderscorePrefixedVariableName:
+  Enabled: false
+
+# Offense count: 1
+# Configuration parameters: CountComments.
+Metrics/ClassLength:
+  Max: 131
+
+# Offense count: 6
+# Configuration parameters: AllowURI, URISchemes.
+Metrics/LineLength:
+  Max: 141
+
+# Offense count: 1
+# Configuration parameters: CountComments.
+Metrics/MethodLength:
+  Max: 11
+
+# Offense count: 3
+# Configuration parameters: IndentWhenRelativeTo, SupportedStyles, IndentOneStep.
+Style/CaseIndentation:
+  Enabled: false
+
+# Offense count: 5
+Style/Documentation:
+  Enabled: false
+
+# Offense count: 5
+Style/DoubleNegation:
+  Enabled: false
+
+# Offense count: 2
+# Configuration parameters: MinBodyLength.
+Style/GuardClause:
+  Enabled: false
+
+# Offense count: 1
+Style/RegexpLiteral:
+  MaxSlashes: 0

Gemfile

@@ -23,4 +23,5 @@ end
 group :development do
   gem 'guard-rspec', '~> 4.2.5'
   gem 'pry'
+  gem 'rubocop'
 end

Rakefile

@@ -10,4 +10,9 @@ end
 
 task :default => :spec
 
+if ENV['CI'] != 'true'
+  require "rubocop/rake_task"
+  default_tasks << RuboCop::RakeTask.new(:rubocop)
+end
+
 task default: default_tasks.map(&:name)