Added example using Devise with Facebook and Google auth

fb_auth/.gitignore

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+# See https://help.github.com/articles/ignoring-files for more about ignoring files.
+#
+# If you find yourself ignoring temporary files generated by your text editor
+# or operating system, you probably want to add a global ignore instead:
+#   git config --global core.excludesfile '~/.gitignore_global'
+
+# Ignore bundler config.
+/.bundle
+
+# Ignore the default SQLite database.
+/db/*.sqlite3
+/db/*.sqlite3-journal
+
+# Ignore all logfiles and tempfiles.
+/log/*
+!/log/.keep
+/tmp

fb_auth/Gemfile

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+source 'https://rubygems.org'
+
+
+# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
+gem 'rails', '4.2.0'
+# Use sqlite3 as the database for Active Record
+gem 'sqlite3'
+# Use SCSS for stylesheets
+gem 'sass-rails', '~> 5.0'
+# Use Uglifier as compressor for JavaScript assets
+gem 'uglifier', '>= 1.3.0'
+# Use CoffeeScript for .coffee assets and views
+gem 'coffee-rails', '~> 4.1.0'
+# See https://github.com/sstephenson/execjs#readme for more supported runtimes
+# gem 'therubyracer', platforms: :ruby
+
+# Use jquery as the JavaScript library
+gem 'jquery-rails'
+# 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', '~> 2.0'
+# bundle exec rake doc:rails generates the API under doc/api.
+gem 'sdoc', '~> 0.4.0', group: :doc
+
+gem 'devise'
+gem 'omniauth'
+gem 'omniauth-facebook' 
+gem 'omniauth-google-oauth2'
+
+# Use ActiveModel has_secure_password
+# gem 'bcrypt', '~> 3.1.7'
+
+# Use Unicorn as the app server
+# gem 'unicorn'
+
+# Use Capistrano for deployment
+# gem 'capistrano-rails', group: :development
+
+group :development, :test do
+  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
+  gem 'byebug'
+
+  # Access an IRB console on exception pages or by using <%= console %> in views
+  gem 'web-console', '~> 2.0'
+
+  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
+  gem 'spring'
+end
+

fb_auth/Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    actionmailer (4.2.0)
+      actionpack (= 4.2.0)
+      actionview (= 4.2.0)
+      activejob (= 4.2.0)
+      mail (~> 2.5, >= 2.5.4)
+      rails-dom-testing (~> 1.0, >= 1.0.5)
+    actionpack (4.2.0)
+      actionview (= 4.2.0)
+      activesupport (= 4.2.0)
+      rack (~> 1.6.0)
+      rack-test (~> 0.6.2)
+      rails-dom-testing (~> 1.0, >= 1.0.5)
+      rails-html-sanitizer (~> 1.0, >= 1.0.1)
+    actionview (4.2.0)
+      activesupport (= 4.2.0)
+      builder (~> 3.1)
+      erubis (~> 2.7.0)
+      rails-dom-testing (~> 1.0, >= 1.0.5)
+      rails-html-sanitizer (~> 1.0, >= 1.0.1)
+    activejob (4.2.0)
+      activesupport (= 4.2.0)
+      globalid (>= 0.3.0)
+    activemodel (4.2.0)
+      activesupport (= 4.2.0)
+      builder (~> 3.1)
+    activerecord (4.2.0)
+      activemodel (= 4.2.0)
+      activesupport (= 4.2.0)
+      arel (~> 6.0)
+    activesupport (4.2.0)
+      i18n (~> 0.7)
+      json (~> 1.7, >= 1.7.7)
+      minitest (~> 5.1)
+      thread_safe (~> 0.3, >= 0.3.4)
+      tzinfo (~> 1.1)
+    arel (6.0.0)
+    bcrypt (3.1.10)
+    binding_of_caller (0.7.2)
+      debug_inspector (>= 0.0.1)
+    builder (3.2.2)
+    byebug (5.0.0)
+      columnize (= 0.9.0)
+    coffee-rails (4.1.0)
+      coffee-script (>= 2.2.0)
+      railties (>= 4.0.0, < 5.0)
+    coffee-script (2.4.1)
+      coffee-script-source
+      execjs
+    coffee-script-source (1.9.1.1)
+    columnize (0.9.0)
+    debug_inspector (0.0.2)
+    devise (3.4.1)
+      bcrypt (~> 3.0)
+      orm_adapter (~> 0.1)
+      railties (>= 3.2.6, < 5)
+      responders
+      thread_safe (~> 0.1)
+      warden (~> 1.2.3)
+    erubis (2.7.0)
+    execjs (2.5.2)
+    faraday (0.9.1)
+      multipart-post (>= 1.2, < 3)
+    globalid (0.3.5)
+      activesupport (>= 4.1.0)
+    hashie (3.4.2)
+    i18n (0.7.0)
+    jbuilder (2.2.16)
+      activesupport (>= 3.0.0, < 5)
+      multi_json (~> 1.2)
+    jquery-rails (4.0.3)
+      rails-dom-testing (~> 1.0)
+      railties (>= 4.2.0)
+      thor (>= 0.14, < 2.0)
+    json (1.8.3)
+    jwt (1.5.0)
+    loofah (2.0.2)
+      nokogiri (>= 1.5.9)
+    mail (2.6.3)
+      mime-types (>= 1.16, < 3)
+    mime-types (2.6.1)
+    mini_portile (0.6.2)
+    minitest (5.7.0)
+    multi_json (1.11.0)
+    multi_xml (0.5.5)
+    multipart-post (2.0.0)
+    nokogiri (1.6.6.2)
+      mini_portile (~> 0.6.0)
+    oauth2 (1.0.0)
+      faraday (>= 0.8, < 0.10)
+      jwt (~> 1.0)
+      multi_json (~> 1.3)
+      multi_xml (~> 0.5)
+      rack (~> 1.2)
+    omniauth (1.2.2)
+      hashie (>= 1.2, < 4)
+      rack (~> 1.0)
+    omniauth-facebook (2.0.1)
+      omniauth-oauth2 (~> 1.2)
+    omniauth-google-oauth2 (0.2.6)
+      omniauth (> 1.0)
+      omniauth-oauth2 (~> 1.1)
+    omniauth-oauth2 (1.3.0)
+      oauth2 (~> 1.0)
+      omniauth (~> 1.2)
+    orm_adapter (0.5.0)
+    rack (1.6.1)
+    rack-test (0.6.3)
+      rack (>= 1.0)
+    rails (4.2.0)
+      actionmailer (= 4.2.0)
+      actionpack (= 4.2.0)
+      actionview (= 4.2.0)
+      activejob (= 4.2.0)
+      activemodel (= 4.2.0)
+      activerecord (= 4.2.0)
+      activesupport (= 4.2.0)
+      bundler (>= 1.3.0, < 2.0)
+      railties (= 4.2.0)
+      sprockets-rails
+    rails-deprecated_sanitizer (1.0.3)
+      activesupport (>= 4.2.0.alpha)
+    rails-dom-testing (1.0.6)
+      activesupport (>= 4.2.0.beta, < 5.0)
+      nokogiri (~> 1.6.0)
+      rails-deprecated_sanitizer (>= 1.0.1)
+    rails-html-sanitizer (1.0.2)
+      loofah (~> 2.0)
+    railties (4.2.0)
+      actionpack (= 4.2.0)
+      activesupport (= 4.2.0)
+      rake (>= 0.8.7)
+      thor (>= 0.18.1, < 2.0)
+    rake (10.4.2)
+    rdoc (4.2.0)
+      json (~> 1.4)
+    responders (2.1.0)
+      railties (>= 4.2.0, < 5)
+    sass (3.4.14)
+    sass-rails (5.0.3)
+      railties (>= 4.0.0, < 5.0)
+      sass (~> 3.1)
+      sprockets (>= 2.8, < 4.0)
+      sprockets-rails (>= 2.0, < 4.0)
+      tilt (~> 1.1)
+    sdoc (0.4.1)
+      json (~> 1.7, >= 1.7.7)
+      rdoc (~> 4.0)
+    spring (1.3.6)
+    sprockets (3.2.0)
+      rack (~> 1.0)
+    sprockets-rails (2.3.1)
+      actionpack (>= 3.0)
+      activesupport (>= 3.0)
+      sprockets (>= 2.8, < 4.0)
+    sqlite3 (1.3.10)
+    thor (0.19.1)
+    thread_safe (0.3.5)
+    tilt (1.4.1)
+    turbolinks (2.5.3)
+      coffee-rails
+    tzinfo (1.2.2)
+      thread_safe (~> 0.1)
+    uglifier (2.7.0)
+      execjs (>= 0.3.0)
+      json (>= 1.8.0)
+    warden (1.2.3)
+      rack (>= 1.0)
+    web-console (2.0.0)
+      activemodel (~> 4.0)
+      binding_of_caller (>= 0.7.2)
+      railties (~> 4.0)
+      sprockets-rails (>= 2.0, < 4.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  byebug
+  coffee-rails (~> 4.1.0)
+  devise
+  jbuilder (~> 2.0)
+  jquery-rails
+  omniauth
+  omniauth-facebook
+  omniauth-google-oauth2
+  rails (= 4.2.0)
+  sass-rails (~> 5.0)
+  sdoc (~> 0.4.0)
+  spring
+  sqlite3
+  turbolinks
+  uglifier (>= 1.3.0)
+  web-console (~> 2.0)

fb_auth/README.rdoc

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+== README
+
+This README would normally document whatever steps are necessary to get the
+application up and running.
+
+Things you may want to cover:
+
+* Ruby version
+
+* System dependencies
+
+* Configuration
+
+* Database creation
+
+* Database initialization
+
+* How to run the test suite
+
+* Services (job queues, cache servers, search engines, etc.)
+
+* Deployment instructions
+
+* ...
+
+
+Please feel free to use a different markup language if you do not plan to run
+<tt>rake doc:app</tt>.

fb_auth/Rakefile

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+# Add your own tasks in files placed in lib/tasks ending in .rake,
+# for example lib/tasks/capistrano.rake, and they will automatically be available to Rake.
+
+require File.expand_path('../config/application', __FILE__)
+
+Rails.application.load_tasks

fb_auth/app/assets/javascripts/application.js

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+// This is a manifest file that'll be compiled into application.js, which will include all the files
+// listed below.
+//
+// Any JavaScript/Coffee file within this directory, lib/assets/javascripts, vendor/assets/javascripts,
+// or any plugin's vendor/assets/javascripts directory can be referenced here using a relative path.
+//
+// It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
+// compiled file.
+//
+// Read Sprockets README (https://github.com/sstephenson/sprockets#sprockets-directives) for details
+// about supported directives.
+//
+//= require jquery
+//= require jquery_ujs
+//= require turbolinks
+//= require_tree .

fb_auth/app/assets/javascripts/products.coffee

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+# Place all the behaviors and hooks related to the matching controller here.
+# All this logic will automatically be available in application.js.
+# You can use CoffeeScript in this file: http://coffeescript.org/

fb_auth/app/assets/stylesheets/application.css

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+/*
+ * This is a manifest file that'll be compiled into application.css, which will include all the files
+ * listed below.
+ *
+ * Any CSS and SCSS file within this directory, lib/assets/stylesheets, vendor/assets/stylesheets,
+ * or any plugin's vendor/assets/stylesheets directory can be referenced here using a relative path.
+ *
+ * You're free to add application-wide styles to this file and they'll appear at the bottom of the
+ * compiled file so the styles you add here take precedence over styles defined in any styles
+ * defined in the other CSS/SCSS files in this directory. It is generally better to create a new
+ * file per style scope.
+ *
+ *= require_tree .
+ *= require_self
+ */

fb_auth/app/assets/stylesheets/products.scss

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+// Place all the styles related to the Products controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: http://sass-lang.com/