upgrade rails from 4.0.13 to 4.2.0

.ruby-version

@@ -1 +1 @@
-1.9.3-p448
+2.1.2

Gemfile

@@ -1,33 +1,32 @@
 source 'https://rubygems.org'
 
-gem 'rails', '4.0.13'
+gem 'rails', '4.2.0'
 gem 'pg'
-gem 'sass-rails', '~> 4.0.2'
+gem 'sass-rails', '~> 5.0'
 gem 'uglifier', '>= 1.3.0'
-gem 'coffee-rails', '~> 4.0.0'
+gem 'coffee-rails', '~> 4.1.0'
 gem 'haml-rails'
 gem 'therubyracer', platforms: :ruby
 gem 'jquery-rails'
 gem 'jquery-ui-rails'
 gem 'turbolinks'
-gem 'jbuilder', '~> 1.2'
-gem 'delayed_job'
-gem 'delayed_job_active_record'
+gem 'jbuilder', '~> 2.0'
+gem 'delayed_job', '~> 4.0.6'
+gem 'delayed_job_active_record', '~> 4.0.3'
 gem "highcharts-rails", "~> 3.0.0"
 gem 'd3_rails'
 # remember to update app/assets/javascripts/private_pub.js when
 # updating private_pub gem!
 # see https://github.com/munen/voicerepublic_backoffice/commit/ca0b016e01481bd500
 gem 'private_pub'
+gem 'devise'
 
-group :doc do
-  gem 'sdoc', require: false
-end
+gem 'sdoc', '~> 0.4.0', group: :doc
 
 # gem 'bcrypt', '~> 3.1.7'
 
 gem 'unicorn'
-gem 'activeadmin', github: 'gregbell/active_admin'
+gem 'activeadmin', github: 'activeadmin/activeadmin'
 gem 'airbrake'
 gem 'rails_config'
 gem 'activeadmin-dragonfly', github: 'stefanoverna/activeadmin-dragonfly'
@@ -42,8 +41,9 @@ group :development do
 end
 
 group :development, :test do
-  gem 'zeus'
+  gem 'spring'
+  gem 'web-console', '~> 2.0'
   gem 'pry-rails'
-  gem 'debugger'
-  gem 'disable_assets_logger'
+  gem 'byebug'
+  #gem 'disable_assets_logger'
 end