Json print

[Vinicius Bernardi]

I had implemented a version to describe messages in JSON using a light weight implementation and useful to debug (printf) the messages , I had changed a little the compiler and include at protobuf headers the JSON version to describe using the same memory area using a printf like ( could be a warper ) , I have no big experience contributing to a open source project, so if it would make sense, pls let me know, and I can try to submit and learn process to contribute at the better way.