Update Chef Zero data
Beef up Gemfile to include all sorts of goodies

* Automation
    * Rake
    * Stove
* Testing
    * ChefSpec
    * Foodcritic
    * Rubocop
    * Test Kitchen
Remove unnecessary files

Testing will now proceed using Test Kitchen, which doesn't require a
Thorfile
Peg Chef-solo-search to specific ref, drop all others

Removing cruft; we just talk to the Chef Server for these now
Set up Test Kitchen
Switch to Stove-style CHANGELOG to automate things
Update to network_interfaces 1.0.0