Yaml frontmatter (#1217)

Render YAML frontmatter

* Fix tests on 5.x

* Update README

* Refactor Page view #table

* Minor refactor

* Refactor

bin/gollum

@@ -131,6 +131,9 @@ MSG
   opts.on("--h1-title", "Use the first '<h1>' as page title.") do
     wiki_options[:h1_title] = true
   end
+  opts.on("--no-display-metadata", "Do not render metadata tables in pages.") do
+    wiki_options[:display_metadata] = false
+  end
   opts.on("--show-all", "Also show files in the file view. By default, only valid pages are shown.") do
     wiki_options[:show_all] = true
   end