Extend Node.js Configuration: Extensions

I really like how the Node.js Configuration submodule creates/updates the nodejs.config.js file my server.js file needs to run properly. However, once I started playing with extensions I no longer could use Node.js Configuration because it overwrote the file and any extensions I had in it. There should be a way for an admin user to put in the paths to js extensions in other modules, without having to write directly to nodejs.config.js file. I will put in an extra field in the node.js config module that will allow for extensions and will write to the file in the proper format when the form is saved.