This is the standard Rails Gemfile , that I use for most rails projects as a starting base.

Gemfile

source 'https://rubygems.org'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.0.0'

# Use mysql as the database for Active Record
gem "mysql2"

# Adds foreign key support to rails Active Record
# https://github.com/matthuhiggins/foreigner
gem 'foreigner'

# versioning and auditing
gem 'paper_trail', '>= 3.0.0.beta1'

# Use SCSS for stylesheets
gem 'sass-rails', '~> 4.0.0'

# Use HAML for templating
gem "haml"
gem "haml-rails"

# Use Devise for security
gem "devise"

# Use can can rule management
gem "cancan"

# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'

# Use CoffeeScript for .js.coffee assets and views
gem 'coffee-rails', '~> 4.0.0'

# See https://github.com/sstephenson/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby

# Use jquery as the JavaScript library
gem 'jquery-rails'

# Batman JS from spotify (JS One page APP MVC)
gem "batman-rails"

# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'

# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 1.2'

group :doc do
  # bundle exec rake doc:rails generates the API under doc/api.
  gem 'sdoc', require: false
end


group :test , :development do
  # == Rspec Testing ==
  gem 'rspec'
  gem 'rspec-rails'
  # == Database Testing ==
  gem 'database_cleaner'
  gem 'factory_girl_rails'

  # == Code Quality ==
  gem 'reek'

  # == Docs ==
  gem 'yard'
  gem 'simplecov'
  gem 'coveralls', require: false

  # == Javascript Testing ==
  gem 'jasmine'
  #gem 'jasmine-rails'

  # == Guard ==
  gem 'guard'
  gem 'guard-rspec'
  gem 'guard-jasmine'
  gem 'terminal-notifier-guard'
  gem 'rb-fsevent', '~> 0.9.1'

  # == Capybara (web testing) - https://github.com/jnicklas/capybara
  gem 'capybara'

  # == Helpful Object Printer - https://github.com/michaeldv/awesome_print
  gem "awesome_print"

  # == Imigrant helpful tool for adding missing foreign keys
  #    https://github.com/jenseng/immigrant
  gem 'immigrant'

  # == Forward HQ a tools for forwarding localhost => the internet
  gem 'forward'
end

group :test do
  gem 'sqlite3'
end