Add config support for Hound CI.

.hound.yml

@@ -0,0 +1,21 @@
+---
+# Too picky.
+LineLength:
+  Enabled: false
+
+# This should truly be on for well documented gems.
+Documentation:
+  Enabled: false
+
+# Neatly aligned code is to swell.
+SingleSpaceBeforeFirstArg:
+  Enabled: false
+
+# Don't mess with RSpec DSL.
+Blocks:
+  Exclude:
+    - 'spec/**/*'
+
+# It say we should use fail over raise.
+SignalException:
+  Enabled: false

.rubocop.yml

@@ -0,0 +1,8 @@
+---
+inherit_from: .hound.yml
+
+AllCops:
+  Exclude:
+    - spec/dummy/**/*
+    - bin/*
+    - Guardfile

spree_related_products.gemspec

@@ -38,4 +38,5 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'sass-rails', '~> 4.0.0'
   s.add_development_dependency 'guard-rspec'
   s.add_development_dependency 'pry-rails'
+  s.add_development_dependency 'rubocop', '>= 0.24.1'
 end