Some Coding Style Suggestions

I've made some changes and added some suggestions to help out with the Node Coding Style Guide. I hope you find it useful.

I'm a frontend from Prestige (Blip/Betfair) btw, and [Jorge Silva](https://github.com/jorgemsrs) asked us if we would like to contribute to this guide. I think it's a good thing you are defining this coding style ahead of time so everyone can agree on a standard and follow it. Well done.