Merge branch 'fix/rubocop' into develop

.rubocop.yml

+inherit_from: ./.rubocop_todo.yml
+
+AllCops:
+  Include:
+    - '**/Rakefile'
+    - '**/config.ru'
+  Exclude:
+    - 'bin/**/*'

.travis.yml

@@ -12,3 +12,6 @@ matrix:
     - rvm: ruby-head
 before_install:
   - rvm @global do gem install bundler
+script:
+  - bundle exec rspec
+  - bundle exec rubocop

Gemfile

@@ -16,6 +16,7 @@ group :development, :test do
   gem 'guard-rspec', require: false
   gem 'terminal-notifier-guard', require: false
   gem 'simplecov', require: false
+  gem 'rubocop', require: false unless RUBY_VERSION =~ /^1.8/
 
   platforms :mri do
     gem 'pry', require: false