add puma binstub

bin/puma

@@ -0,0 +1,32 @@
+#!/usr/bin/env ruby
+#
+# This file was generated by Bundler.
+#
+# The application 'puma' is installed as part of a gem, and
+# this file is here to facilitate running it.
+#
+
+if ARGV[0] == '--kill-existing'
+  ARGV.delete_at(0)
+
+  pids = `ps aux | grep puma | grep discourse | grep -v grep | awk '{print $2;}'`.strip
+    .split("\n")
+    .map(&:to_i)
+    .reject{|pid| pid == Process.pid}
+
+  if pids.length > 0
+    STDERR.puts "Terminating old version of puma at pid #{pids[0]}"
+    `kill -9 #{pids[0]}`
+    sleep 1
+  end
+
+end
+
+require 'pathname'
+ENV['BUNDLE_GEMFILE'] ||= File.expand_path("../../Gemfile",
+  Pathname.new(__FILE__).realpath)
+
+require 'rubygems'
+require 'bundler/setup'
+
+load Gem.bin_path('puma', 'puma')