add rubocop to gemfile

Gemfile

@@ -23,7 +23,7 @@ gem 'therubyracer', platforms: :ruby
 # gem 'turbolinks'
 
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
-gem 'jbuilder'
+# gem 'jbuilder'
 
 gem 'i18n_generators'
 
@@ -69,8 +69,6 @@ group :development do
   # profiler
   gem 'rack-mini-profiler'
 
-  # rubocop
-  gem 'rubocop'
   gem 'guard-rspec', require: false
   gem 'guard-rubocop'
   # gem 'guard-spring'
@@ -97,6 +95,8 @@ group :development, :test do
   gem 'byebug'
 
   gem 'dotenv-rails'
+
+  gem 'rubocop'
 end
 
 group :test do
@@ -157,7 +157,7 @@ gem 'rmagick', require: 'RMagick'
 
 # for heroku
 gem 'rails_12factor', group: :production
-gem 'mysql'
+# gem 'mysql'
 
 # for IP restriction
 gem 'rack-contrib', require: 'rack/contrib'

Gemfile.lock

@@ -206,9 +206,6 @@ GEM
     i18n_generators (1.2.1)
       mechanize
       rails (>= 3.0.0)
-    jbuilder (2.2.4)
-      activesupport (>= 3.0.0, < 5)
-      multi_json (~> 1.2)
     jquery-rails (3.1.2)
       railties (>= 3.0, < 5.0)
       thor (>= 0.14, < 2.0)
@@ -242,7 +239,6 @@ GEM
     multi_json (1.10.1)
     multi_xml (0.5.5)
     multipart-post (2.0.0)
-    mysql (2.9.1)
     mysql2 (0.3.16)
     net-http-digest_auth (1.4)
     net-http-persistent (2.9.4)
@@ -484,13 +480,11 @@ DEPENDENCIES
   guard-teaspoon
   hipchat
   i18n_generators
-  jbuilder
   jquery-rails
   jwt (= 0.1.11)
   kaminari!
   launchy
   mail
-  mysql
   mysql2
   newrelic_rpm
   nokogiri