class Hash
	def execute
	  self.each{|k,v|
	  	v.execute if v.respond_to?(:execute)
	  }
    end
	def to_html
      [
        '<ul>',
        map { |k, v| ["<li><strong>#{k}</strong>", v.respond_to?(:to_html) ? v.to_html : "<span>#{v}</span></li>"] },
        '</ul>'
      ].join
    end
end