Fixes #414 - integrates rubocop gem

Adds rubocop gem and fixes majority of issues noted by cop.
Avoid line continuation here. Try this instead:
```ruby
VCR.use_cassette(
  'dynamic/location_details/superscript_dynamic',
  erb: { name: "The 1st, 2nd, 3rd, and 4th of 25th st & broad rd" }
) do
```