* update nodejs server oas2
* update nodejs server petstore with oas3
* update nodejs google cloud with oas2 petstore
* update nodejs server google function with oas3
* Another approach: extending NodeJS server to support GCF.
This does not add a new language, but adding some client options
to support Google Cloud Functions (GCF).
* Add URLs for how to deploy the generated code.
Adds the client options help message and the README.md file.