Baseline redundancy branch

[dylankb]

This is a bit of a rough branch, but still wanted to put it out there if others had thoughts.

1. Calculates file data redundancy based on a baseline number
2. Displays output of this test in the batchain terminal window for the audit command (but it wasn't fun)
3. Tidying up code in a couple places
4. Added instructions section to the readme for running a local demo

Re: point 2), because using the async/await pattern seems a bit difficult to do in audit, I opted to get a working solution that's a little quick-and-dirty. I'm using the backoff npm package to wait until instance variables on the batnode object say that the correct data is there.

[WilfredTA]

Can you integrate the changes into start.js? That way, when a user downloads the repo and starts up the program with start.js, audits will work way they do in your demo

Especially since the global batnode.js file is updated to reflect the new feature(s) you added, it would be good for the global start script to follow suit

[dylankb]

Yeah, good catch that wasn't intentional. I added the logic to the start script as well.