Add puma config. Remove unicorn config

Procfile

@@ -1 +1 @@
-web: bundle exec puma
+web: bundle exec puma -C config/puma.rb

config/puma.rb

@@ -0,0 +1,9 @@
+workers Integer(ENV['WEB_CONCURRENCY'] || 2)
+threads_count = Integer(ENV['MAX_THREADS'] || 5)
+threads threads_count, threads_count
+
+preload_app!
+
+rackup      DefaultRackup
+port        ENV['PORT']     || 3000
+environment ENV['RACK_ENV'] || 'development'

config/unicorn.rb

@@ -1,21 +0,0 @@
-worker_processes Integer(ENV['UNICORN_WORKERS'] || 4)
-timeout 30
-preload_app true
-listen(ENV['PORT'] || 3000, :backlog => Integer(ENV['UNICORN_BACKLOG'] || 200))
-
-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
-
-  if defined?(Sequel::Model)
-    Sequel::DATABASES.each{ |db| db.disconnect }
-  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