Vendor the external cookbooks

Knife-Zero doesn't include Berkshelf support, so vendoring everything in
the repo is convenient again

cookbooks/redis/spec/spec_helper.rb

@@ -0,0 +1,20 @@
+begin
+  require "chefspec"
+  require "chefspec/berkshelf"
+rescue LoadError
+  puts "Unable to run `chefspec`"
+  exit
+end
+
+RSpec.configure do |config|
+  config.platform = "ubuntu"
+  config.version = "12.04"
+  config.log_level = :error
+  config.raise_errors_for_deprecations!
+end
+
+def add_apt_repository(resource_name)
+  ChefSpec::Matchers::ResourceMatcher.new(:apt_repository, :add, resource_name)
+end
+
+at_exit { ChefSpec::Coverage.report! }