(PDOC-159) server urls fix

When using `puppet strings server`, resources with names containing '::' end up 404ing from the left bar. This is because strings namespaces these objects but YARD does not when building URLs.
e.g. foo::bar's url should be /doc/foo/puppet_classes/foo/bar.html but
ends up instead being doc/foo/puppet_classes/foo_3A_3A_bar.html because
of YARD's url encoding. This is a monkey patch, courtesy @domcleal, that
decodes the urls back so that they are namespaced correctly.

lib/puppet-strings/monkey_patches/display_object_command.rb

@@ -0,0 +1,11 @@
+# Monkey patch URL decoding in object displays. Usually :: is interpreted as a
+# namespace, but this is disabled in our base object, and so instead gets
+# URL-encoded.
+require 'yard/server/commands/display_object_command'
+class YARD::Server::Commands::DisplayObjectCommand
+  private
+  alias_method :object_path_yard, :object_path
+  def object_path
+    object_path_yard.gsub('_3A', ':')
+  end
+end

lib/puppet-strings/yard.rb

@@ -6,6 +6,7 @@ module PuppetStrings::Yard
   require 'puppet-strings/yard/handlers'
   require 'puppet-strings/yard/tags'
   require 'puppet-strings/yard/parsers'
+  require 'puppet-strings/monkey_patches/display_object_command'
 
   # Sets up YARD for use with puppet-strings.
   # @return [void]