Fix UTF-8

to_html uses source document encoding by default. Set UTF-8.

Add note about KCODE warning.

lib/gollum.rb

@@ -24,6 +24,8 @@ require File.expand_path('../gollum/web_sequence_diagram', __FILE__)
 require File.expand_path('../gollum/frontend/uri_encode_component', __FILE__)
 
 # Set ruby to UTF-8 mode
+# Do not remove because of warning.
+# This is required for Ruby 1.8.7 which gollum still supports.
 $KCODE = 'U'
 
 module Gollum

lib/gollum/frontend/views/page.rb

@@ -134,7 +134,7 @@ module Precious
       def page_header_from_content(content)
         doc = build_document(content)
         title = find_header_node(doc)
-        Sanitize.clean(title.to_html).strip unless title.empty?
+        Sanitize.clean(title.to_html(:encoding => 'UTF-8')).strip unless title.empty?
       end
 
       # Returns page content without title if it was extracted.