module RedcarpetHeaderFix
  def header(text, level, id)
    clean_id = id.gsub(/[\.]/, '-').gsub(/[^a-zA-Z0-9\-_]/, '')
    "<h#{level} id='#{clean_id}'>#{text}</h1>"
  end
end

require 'middleman-core/renderers/redcarpet'
Middleman::Renderers::MiddlemanRedcarpetHTML.send :include, RedcarpetHeaderFix