Thanks Steve, it's been fun work using Node-RED for doing this.
Can you point me in the direction of an example NPM package that does what you describe? I'm don't have many NPM experiences and I certainly don't know the best practices when it comes to creating packages.
That's just GitHub - GitHub - gorenje/cdn.openmindmap.org: image content and discussions for blog.openmindmap.org - that was my GitHub flow, i.e. the reason I built it - so that I could get a cdn for free! 
IDs would become additions/deletions, props are compared and become changed node i.e. purple in colour. I use the same comparison code that Node-RED uses with some extensions though.
Edit: Apropo prop change, this example is one -- click on the purple node "Git commit - Press Here" and you'll see a prop change.
(ignore the don't press here notice)
Prop comparison is done because of this else it was always [object Object].
Edit2: for those interested in the codebase, it's once again a Node-RED flow.
