Delegate processing to YARD::CLI::Yardoc

Loading `Puppetx::Yardoc::YARD::Plugin` registers the subsystems for Puppet
documentation with YARD. At this point, execution can be handed off to the
`YARD::CLI::Yardoc` tool.

lib/puppet/face/yardoc.rb

@@ -17,10 +17,8 @@ Puppet::Face.define(:yardoc, '0.0.1') do
 
       require 'puppetx/yardoc/yard/plugin'
 
-      parser = Puppetx::Yardoc::YARD::PuppetParser.new(File.read(manifest), manifest)
-      parser.parse
-
-      return parser.enumerator.map {|s| s.comments}
+      # Hand off to YARD for further processing.
+      YARD::CLI::Yardoc.run(manifest)
     end
   end
 end