Fixed a bug (or is it just a change of opinion since I first wrote it…

…?) where the outline filter would add numbering to headers that are excluded from the table of contents range. Now the outline numbering matches the ToC generation.

lib/webby/filters/outline.rb

@@ -132,7 +132,8 @@ def filter
     @toc_range = Integer(m[1])..Integer(m[2])
     @list_opening = build_list_opening(toc_elem)
 
-    doc.traverse_element(*%w[h1 h2 h3 h4 h5 h6]) do |elem|
+    headers = @toc_range.map {|x| "h#{x}"}
+    doc.traverse_element(*headers) do |elem|
       text, id = heading_info(elem)
       add_to_toc(text, id) if @toc_range.include? current_level
     end