Add updated upstream nodejs cookbook

... and its new dependency, chocolatey

cookbooks/chocolatey/libraries/helpers.rb

@@ -0,0 +1,55 @@
+module Chocolatey
+  module Helpers
+    # include the PowershellOut module from the windows cookbook
+    # in case we are running an older chef client
+    include Chef::Mixin::PowershellOut
+
+    # Get the ChocolateyInstall directory from the environment.
+    def chocolatey_install
+      ENV.fetch('ChocolateyInstall') { |env_var| machine_env_var(env_var) }
+    end
+
+    # The Chocolatey command.
+    #
+    # Reference: https://github.com/chocolatey/chocolatey-cookbook/pull/16#issuecomment-47975896
+    def chocolatey_executable
+      "\"#{::File.join(chocolatey_install, 'bin', 'choco')}\""
+    end
+
+    def chocolatey_lib_dir
+      File.join(chocolatey_install, 'lib', 'chocolatey')
+    end
+
+    # Check if Chocolatey is installed
+    def chocolatey_installed?
+      return @is_chocolatey_installed if @is_chocolatey_installed
+      return false if chocolatey_install.nil?
+      # choco /? returns an exit status of -1 with chocolatey 0.9.9 => use list
+      cmd = Mixlib::ShellOut.new("#{chocolatey_executable} list -l chocolatey")
+      cmd.run_command
+      @is_chocolatey_installed = cmd.exitstatus == 0
+    end
+
+    # combine the local path with the user and machine paths
+    def environment_path(local_path)
+      machine  = env_var('PATH', 'MACHINE').split(';')
+      user     = env_var('PATH', 'USER').split(';')
+      local    = local_path.split(';')
+      combined = local.concat(machine).concat(user).uniq.compact
+      combined.join(';')
+    end
+
+    private
+
+    def machine_env_var(env_var)
+      env_var(env_var, 'MACHINE')
+    end
+
+    def env_var(env_var, scope)
+      env_var = powershell_out!(
+        "[System.Environment]::GetEnvironmentVariable('#{env_var}', '#{scope}')"
+      )
+      env_var.stdout.chomp
+    end
+  end
+end