Update location/name of Chef’s public GPG key
Don’t clone entire chef-docs repository for single file

This repo has some hefty multi-GB history that can make for extremely
slow builds.
Add `.kitchen.local.yml` to the `.gitignore` file
Merge pull request #636 from opscode/schisamo/update-gpg-key-location

Update GPG key location / Don't fetch full chef-docs repo