Use Unicorn instead of Thin

See https://blog.heroku.com/archives/2013/2/27/unicorn_rails

Gemfile

@@ -25,8 +25,8 @@ gem 'omniauth'
 gem 'omniauth-github'
 gem 'omniauth-twitter'
 
-# Thin
-gem 'thin'
+# Unicorn
+gem 'unicorn'
 
 # New Relic
 gem 'newrelic_rpm'
@@ -54,6 +54,7 @@ group :development do
   gem 'heroku'
   gem 'better_errors'
   gem 'binding_of_caller'
+  gem 'quiet_assets'
 
   # Virtual box provisioning with vagrant and librarian gems
   gem 'vagrant'

Gemfile.lock

@@ -52,11 +52,9 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.3.3)
-    daemons (1.1.8)
     dalli (2.0.5)
     debug_inspector (0.0.2)
     erubis (2.7.0)
-    eventmachine (0.12.10)
     exception_notification (2.6.1)
       actionmailer (>= 3.0.4)
     excon (0.14.0)
@@ -99,6 +97,7 @@ GEM
       actionpack (>= 3.0.0)
       activesupport (>= 3.0.0)
       railties (>= 3.0.0)
+    kgio (2.8.0)
     launchy (2.1.0)
       addressable (~> 2.2.6)
     librarian (0.0.4)
@@ -150,6 +149,8 @@ GEM
       multi_json (~> 1.3)
       omniauth-oauth (~> 1.0)
     polyglot (0.3.3)
+    quiet_assets (1.0.1)
+      railties (~> 3.1)
     rack (1.4.5)
     rack-cache (1.2)
       rack (>= 0.4)
@@ -172,6 +173,7 @@ GEM
       rake (>= 0.8.7)
       rdoc (~> 3.4)
       thor (>= 0.14.6, < 2.0)
+    raindrops (0.11.0)
     rake (10.0.4)
     rdoc (3.12.2)
       json (~> 1.4)
@@ -191,10 +193,6 @@ GEM
       tilt (~> 1.1, != 1.3.0)
     therubyracer (0.10.1)
       libv8 (~> 3.3.10)
-    thin (1.3.1)
-      daemons (>= 1.0.9)
-      eventmachine (>= 0.12.6)
-      rack (>= 1.0.0)
     thor (0.18.1)
     tilt (1.3.6)
     treetop (1.4.12)
@@ -204,6 +202,10 @@ GEM
     uglifier (1.2.4)
       execjs (>= 0.3.0)
       multi_json (>= 1.0.2)
+    unicorn (4.6.2)
+      kgio (~> 2.6)
+      rack
+      raindrops (~> 0.7)
     vagrant (0.5.4)
       archive-tar-minitar (= 0.5.2)
       erubis (>= 2.6.6)
@@ -238,9 +240,10 @@ DEPENDENCIES
   omniauth
   omniauth-github
   omniauth-twitter
+  quiet_assets
   rails (= 3.2.13)
   sass-rails (~> 3.2.3)
   therubyracer
-  thin
   uglifier (>= 1.0.3)
+  unicorn
   vagrant

Procfile

@@ -1 +1 @@
-web: bundle exec rails server thin -p $PORT
+web: bundle exec unicorn -p $PORT -c ./config/unicorn.rb

config/unicorn.rb

@@ -0,0 +1,16 @@
+worker_processes 3
+timeout 30
+preload_app true
+
+before_fork do |server, worker|
+  Signal.trap 'TERM' do
+    puts 'Unicorn master intercepting TERM and sending myself QUIT instead'
+    Process.kill 'QUIT', Process.pid
+  end
+end
+
+after_fork do |server, worker|
+  Signal.trap 'TERM' do
+    puts 'Unicorn worker intercepting TERM and doing nothing. Wait for master to sent QUIT'
+  end
+end