Attempting to fix heroku not serving static assets

Gemfile

@@ -37,14 +37,13 @@ gem 'haml_assets'
 # gem 'handlebars_assets'
 gem 'i18n-js'
 gem 'jquery-turbolinks'
-# gem 'less-rails'
 gem 'sass-rails', '~> 4.0.0'
 gem 'therubyracer'
 gem 'compass-rails', '~> 2.0.alpha.0'
 gem 'zurb-foundation'
 gem 'turbolinks'
-# gem 'twitter-bootstrap-rails', github: 'diowa/twitter-bootstrap-rails', branch: 'fontawesome-3.2.1'
 gem 'uglifier', '>= 1.3.0'
+gem 'rails_12factor', group: :production
 
 group :development, :test do
   gem 'debugger'

config/environments/production.rb

@@ -27,7 +27,7 @@ Starterapp::Application.configure do
   # config.assets.css_compressor = :sass
 
   # Do not fallback to assets pipeline if a precompiled asset is missed.
-  config.assets.compile = false
+  config.assets.compile = true
 
   # Generate digests for assets URLs.
   config.assets.digest = true
@@ -36,7 +36,7 @@ Starterapp::Application.configure do
   config.assets.version = '1.0'
 
   # Specifies the header that your server uses for sending files.
-  # config.action_dispatch.x_sendfile_header = "X-Sendfile" # for apache
+  config.action_dispatch.x_sendfile_header = "X-Sendfile" # for apache
   # config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect' # for nginx
 
   # Force all access to the app over SSL, use Strict-Transport-Security, and use secure cookies.