avoid server sometime will crash when using io.open to command

temp_file/playground_controller.rb

@@ -169,7 +169,9 @@ class Admin::PlaygroundController < OrbitAdminController
 		mode = Rails.env if mode.nil?
 		unicorn_rails = %x[which unicorn_rails].sub("\n",'')
 		content = "kill -s TERM `cat tmp/pids/unicorn.pid` && bundle exec #{unicorn_rails} -c config/unicorn.rb -D -E #{mode} | at now"
-		exec_other_command(content)
+		Thread.new do
+			Bundler.with_clean_env{system(content)}
+		end
 	end
 
 	def check_for_testers