Replace unicorn with puma

Gemfile

@@ -20,15 +20,15 @@ gem "omniauth"
 gem "omniauth-github-team-member"
 gem "omniauth-oauth2", "~> 1.3.1"
 gem "pg"
+gem "puma"
 gem "rack-timeout"
-gem "rake", "~> 11"
 gem "rails", "~> 4.2"
+gem "rake", "~> 11"
 gem "recipient_interceptor"
 gem "sass-rails"
 gem "time_for_a_boolean"
 gem "title"
 gem "uglifier"
-gem "unicorn"
 
 group :development do
   gem "bundler-audit"

Gemfile.lock

@@ -167,7 +167,6 @@ GEM
     kaminari (0.17.0)
       actionpack (>= 3.0.0)
       activesupport (>= 3.0.0)
-    kgio (2.11.2)
     launchy (2.4.3)
       addressable (~> 2.3)
     loofah (2.2.2)
@@ -218,6 +217,7 @@ GEM
     pry-rails (0.3.4)
       pry (>= 0.9.10)
     public_suffix (3.0.3)
+    puma (3.12.0)
     rack (1.6.10)
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -252,7 +252,6 @@ GEM
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
     rainbow (3.0.0)
-    raindrops (0.19.0)
     rake (11.3.0)
     ransack (1.7.0)
       actionpack (>= 3.0)
@@ -331,9 +330,6 @@ GEM
       execjs (>= 0.3.0)
       json (>= 1.8.0)
     unicode-display_width (1.4.0)
-    unicorn (5.4.1)
-      kgio (~> 2.6)
-      raindrops (~> 0.7)
     webmock (3.4.2)
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
@@ -373,6 +369,7 @@ DEPENDENCIES
   omniauth-oauth2 (~> 1.3.1)
   pg
   pry-rails
+  puma
   rack-timeout
   rails (~> 4.2)
   rails_12factor
@@ -386,7 +383,6 @@ DEPENDENCIES
   timecop
   title
   uglifier
-  unicorn
   webmock
 
 RUBY VERSION

Procfile

@@ -1,2 +1,2 @@
-web: bundle exec unicorn -p $PORT -c ./config/unicorn.rb
+web: bundle exec puma -C ./config/puma.rb
 worker: bundle exec rake jobs:work

config/puma.rb

@@ -0,0 +1,47 @@
+# Puma can serve each request in a thread from an internal thread pool.
+# The `threads` method setting takes two numbers a minimum and maximum.
+# Any libraries that use thread pools should be configured to match
+# the maximum value specified for Puma. Default is set to 5 threads for minimum
+# and maximum, this matches the default thread size of Active Record.
+#
+threads_count = ENV.fetch("RAILS_MAX_THREADS") { 5 }.to_i
+threads threads_count, threads_count
+
+# Specifies the `port` that Puma will listen on to receive requests, default is 3000.
+#
+port        ENV.fetch("PORT") { 3000 }
+
+# Specifies the `environment` that Puma will run in.
+#
+environment ENV.fetch("RAILS_ENV") { "development" }
+
+# Specifies the number of `workers` to boot in clustered mode.
+# Workers are forked webserver processes. If using threads and workers together
+# the concurrency of the application would be max `threads` * `workers`.
+# Workers do not work on JRuby or Windows (both of which do not support
+# processes).
+#
+workers ENV.fetch("WEB_CONCURRENCY") { 2 }
+
+# Use the `preload_app!` method when specifying a `workers` number.
+# This directive tells Puma to first boot the application and load code
+# before forking the application. This takes advantage of Copy On Write
+# process behavior so workers use less memory. If you use this option
+# you need to make sure to reconnect any threads in the `on_worker_boot`
+# block.
+#
+preload_app!
+
+# The code in the `on_worker_boot` will be called if you are using
+# clustered mode by specifying a number of `workers`. After each worker
+# process is booted this block will be run, if you are using `preload_app!`
+# option you will want to use this block to reconnect to any threads
+# or connections that may have been created at application boot, Ruby
+# cannot share connections between processes.
+#
+on_worker_boot do
+  ActiveRecord::Base.establish_connection if defined?(ActiveRecord)
+end
+
+# Allow puma to be restarted by `rails restart` command.
+plugin :tmp_restart