Enable a bunch more markdown options.

Allow Snap_!_ to be rendered right.

app/helpers/format_helper.rb

@@ -191,9 +191,12 @@ module FormatHelper
     return '' if text.nil?
 
     options = {
-      autolink:            true,
+      autolink: true,
       space_after_headers: true,
-      no_intra_emphasis:   true
+      tables: true,
+      strikethrough: true,
+      footnotes: true,
+      superscript: true
     }
     markdown = Redcarpet::Markdown.new(Redcarpet::Render::HTML.new(escape_html: escape_html), options)
     markdown.render(text).html_safe