chore(rubocop): organize the gemfile

Gemfile

@@ -6,18 +6,31 @@ gem "rails", "5.1.4"
 
 ruby "2.4.2"
 
+gem "aruba"
+gem "bcrypt"
+gem "coffee-rails"
+gem "execjs"
+gem "foreman"
+gem "jquery-fileupload-rails"
+gem "jquery-rails"
+gem "minitest"
+gem "powder" # Pow related gem
+gem "pry-rails" # not in dev group in case running via prod/staging @ a training
 gem "rails-perftest"
 gem "rake"
+gem "responders" #For Rails 4.2
 gem "ruby-prof"
+gem "sass-rails"
+gem "simplecov", require: false, group: :test
+gem "sqlite3"
+gem "therubyracer"
+gem "turbolinks"
+gem "uglifier"
+gem "unicorn"
 
-# Bundle edge Rails instead:
-# gem 'rails', git: 'https://github.com/rails/rails'
-
-gem 'sqlite3'
-gem 'foreman'
-
-# Pry for Rails, not in dev group in case running via prod/staging @ a training
-gem "pry-rails"
+# Add SMTP server support using MailCatcher
+# NOTE: https://github.com/sj26/mailcatcher#bundler
+# gem 'mailcatcher'
 
 group :development, :mysql do
   gem "better_errors"
@@ -35,8 +48,6 @@ group :development, :mysql do
   gem "travis-lint"
 end
 
-gem "simplecov", require: false, group: :test
-
 group :development, :test, :mysql do
   gem "capybara"
   gem "database_cleaner"
@@ -49,44 +60,3 @@ end
 group :mysql do
   gem "mysql2"
 end
-
-# Gems used only for assets and not required
-# in production environments by default.
-gem "coffee-rails"
-gem "jquery-fileupload-rails"
-gem "sass-rails"
-gem "turbolinks"
-gem "uglifier"
-
-# See https://github.com/sstephenson/execjs#readme for more supported runtimes
-# gem 'therubyracer', :platforms => :ruby
-
-gem "jquery-rails"
-
-# To use ActiveModel has_secure_password
- gem "bcrypt"
-
-# Use unicorn as the app server
-gem "unicorn"
-
-# Pow related gem
-gem "powder"
-
-gem "aruba"
-gem "execjs"
-gem "therubyracer"
-
-# Add SMTP server support using MailCatcher
-# NOTE: https://github.com/sj26/mailcatcher#bundler
-# gem 'mailcatcher'
-
-#For Rails 4.0
-#group :doc do
-#  # bundle exec rails doc:rails generates the API under doc/api.
-#  gem 'sdoc', require: false
-#end
-
-#For Rails 4.2
-gem "responders"
-
-gem "minitest"