Multistep Refactor, Renaming

This was basically a complete re-write to play around with [mitchellh/multistep](https://github.com/mitchellh/multistep) and to learn a bit more about Go.

The steps package is pretty thoroughly tested, and contains various steps that are run by "runners", both from `main.go` (command line arguments) and from internal process.

Somewhat questionable that this project could have such high LOC seeing as it's doing a pretty trivial operation. That being said, it's cool to have error checking, GitHub OAuth, ignores, various other configurations.

Some to-do's before this branch is complete:

- [ ] Binary build process for major platforms
- [ ] Configuration checking, to make sure folks don't mess with their configurations
- [ ] (Maybe) Integration-like tests for the command line interface

:walking: