Pin chef and test-kitchen versions.
Hardcode ruby devkit into Windows customization

Fixes chef-dk#100 by adding hardcoding the necessary bits for the devkit
into the operating_system.rb file that we currently create to ensure gems
are installed into the users directory on Windows. Also reverts 5b99247,
as it proved only half of a solution, the other half being complicated
balancing of build-order to make sure rubygems-customization happened at
exactly the right time (before devkit, but not before bundler, at least).
Make sure the aux gems are installed into the embedded directory.
Include fauxhai for chefspec.
Merge pull request #225 from opscode/sersut/dk-rel-prep

Chef DK Release Prep
Merge pull request #224 from opscode/btm/devkit-fix

Hardcode ruby devkit into Windows customization
AIX Testing WIP
Use master of mixlib-shellout since there have been many unreleased
AIX fixes