Simpler merging

Made merging a little simpler.

- Merging line by line in node is slow: 20m 18.847s
- Merging with tail and cat is faster: 2m 0.770s

I had some progress text (Processed x%) but it slowed things down dramatically. Unfortunately my bash skills aren't good enough for me to know how to fix it so I removed it.

I might have gotten a little hasty removing package.json, let me know if you want that back.