Reverted messy attempt at switch to Puma as app server.

lib/capistrano/tasks/unicorn.rake

@@ -0,0 +1,40 @@
+namespace :deploy do
+  after :start, :start_unicorn do
+    invoke 'unicorn:start'
+  end
+
+  after :stop, :stop_unicorn do
+    invoke 'unicorn:stop'
+  end
+
+  after :restart, :restart_unicorn do
+    begin
+      invoke "unicorn:restart"
+    rescue SSHKit::Runner::ExecuteError
+      invoke "unicorn:start"
+    end
+  end
+end
+
+namespace :unicorn do
+  desc "Start Unicorn"
+  task :start do
+    on roles(:web) do
+      execute :sudo, :start, "unicorn"
+    end
+  end
+
+  desc "Stop Unicorn"
+  task :stop do
+    on roles(:web) do
+      execute :sudo, :stop, "unicorn"
+    end
+  end
+
+  desc "Restart Unicorn"
+  task :restart do
+    on roles(:web), in: :sequence, wait: 5 do
+      execute :sudo, :restart, "unicorn"
+    end
+  end
+end