add 12factor

Gemfile

@@ -149,3 +149,7 @@ gem 'hipchat'
 
 # For PDF upload
 gem 'rmagick', :require => 'RMagick'
+
+
+# for heroku
+gem 'rails_12factor', group: :production

Gemfile.lock

@@ -397,6 +397,11 @@ GEM
       bundler (>= 1.3.0, < 2.0)
       railties (= 4.1.7)
       sprockets-rails (~> 2.0)
+    rails_12factor (0.0.3)
+      rails_serve_static_assets
+      rails_stdout_logging
+    rails_serve_static_assets (0.0.2)
+    rails_stdout_logging (0.0.3)
     railties (4.1.7)
       actionpack (= 4.1.7)
       activesupport (= 4.1.7)
@@ -562,6 +567,7 @@ DEPENDENCIES
   pry-rails
   rack-mini-profiler
   rails (~> 4.1)
+  rails_12factor
   rmagick
   rspec-rails
   rubocop