Add rubocop and clean-up the code base according to its complaints

[wbreeze]

The rubocop (ruby linting) program run against this code base produces over five hundred complaints. It will be a big job, but adding rubocop and addressing the complaints will improve the code base and enable continuous monitoring by rubocop to keep the code base spit spot.

A little bit of rubocop configuration to eliminate complaint that feels overly strict, is okay but keep it to the minimum.

[wbreeze]

Can add it straight away. No need to fix everything that exists. There's a feature to put exceptions into a configuration type file. Then chip-away at them as they're touched.