Rubocop setup

[jtwhittington]

This is with base rubocop styles. If anyone objects to anything speak now

https://github.com/rubocop-hq/ruby-style-guide

[jgaskins]

Directories to ignore:

• config — mostly autogenerated files
• spec — I'm less concerned with coding style in specs, I think, since it's not typical class/module stuff
• db — mostly autogenerated files

[jgaskins]

bin, also, since it's mostly autogenerated files