Upgrade Unicorn

In this change I'm upgrading unicorn in order to get the call back
`after_worker_exit`. I need this in development to kill ghost workers
that are pilling up on my computer every time I restart the app.

Gemfile

@@ -4,7 +4,6 @@ source "https://rubygems.org"
 
 group :production do
   gem "pg", "~> 0.18.4"
-  gem "unicorn", "~> 4.7"
 end
 
 group :development do
@@ -46,4 +45,5 @@ gem "sprockets", "~> 3.0"
 gem "sprockets-helpers"
 gem "thread", "~> 0.2"
 gem "uglifier"
+gem "unicorn", "~> 5.4.0"
 gem "will_paginate", "~> 3.1"

Gemfile.lock

@@ -64,7 +64,7 @@ GEM
       sax-machine (>= 1.0)
     i18n (0.7.0)
     json (1.8.3)
-    kgio (2.10.0)
+    kgio (2.11.2)
     loofah (2.1.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
@@ -100,7 +100,7 @@ GEM
       rack (>= 1.0)
       rack-test (>= 0.5)
     rainbow (2.1.0)
-    raindrops (0.16.0)
+    raindrops (0.19.0)
     rake (10.5.0)
     rspec (3.4.0)
       rspec-core (~> 3.4.0)
@@ -170,9 +170,8 @@ GEM
     uglifier (3.0.2)
       execjs (>= 0.3.0, < 3)
     unicode-display_width (1.0.2)
-    unicorn (4.9.0)
+    unicorn (5.4.0)
       kgio (~> 2.6)
-      rack
       raindrops (~> 0.7)
     will_paginate (3.1.0)
     xpath (2.0.0)
@@ -216,7 +215,7 @@ DEPENDENCIES
   thread (~> 0.2)
   timecop (~> 0.8)
   uglifier
-  unicorn (~> 4.7)
+  unicorn (~> 5.4.0)
   will_paginate (~> 3.1)
 
 RUBY VERSION

config/unicorn.rb

@@ -21,3 +21,7 @@
     ActiveRecord::Base.establish_connection(config)
   end
 end
+
+after_worker_exit do |_server, _worker, _status|
+  Process.kill("QUIT", @delayed_job_pid) if !ENV["RACK_ENV"] || ENV["RACK_ENV"] == "development"
+end