Merge pull request #130 from blt04/close_on_exec

Ensure socket connections are closed after exec

lib/bluepill/application.rb

@@ -91,6 +91,7 @@ def start_listener
         loop do
           begin
             client = self.socket.accept
+            client.close_on_exec = true
             command, *args = client.readline.strip.split(":")
             response = begin
               mutex { self.send(command, *args) }