Not our job to enforce a gemset or Ruby version.
Don't allow jRuby head to fail.
A little bit of cleanup.

* Remove guard-rspec, it's hefty.
* Constrain some versions.
* Clean up the way the source is organized.
That should be 2.13.0, 2.14.0 is not released yet.
Add some color to my life.
Readability and Quotes.
Use require_relative.
Quotes.
Update version.