add rails 12 factor gem

Gemfile

@@ -43,3 +43,8 @@ group :development, :test do
   gem 'spring'
 end
 
+group :production do
+  gem 'rails_12factor'
+end
+
+ruby "2.2.2"

Gemfile.lock

@@ -97,6 +97,11 @@ GEM
       rails-deprecated_sanitizer (>= 1.0.1)
     rails-html-sanitizer (1.0.2)
       loofah (~> 2.0)
+    rails_12factor (0.0.3)
+      rails_serve_static_assets
+      rails_stdout_logging
+    rails_serve_static_assets (0.0.4)
+    rails_stdout_logging (0.0.3)
     railties (4.2.3)
       actionpack (= 4.2.3)
       activesupport (= 4.2.3)
@@ -147,6 +152,7 @@ DEPENDENCIES
   jquery-rails
   pg
   rails (= 4.2.3)
+  rails_12factor
   sass-rails (~> 5.0)
   sdoc (~> 0.4.0)
   spring
@@ -155,4 +161,4 @@ DEPENDENCIES
   web-console (~> 2.0)
 
 BUNDLED WITH
-   1.10.2
+   1.10.6

Rakefile

@@ -1,6 +1,5 @@
 # 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