fetch_dir

# File railties/lib/rails/commands/plugin.rb, line 535
  def fetch_dir(url)
    @level += 1
    push_d(File.basename(url)) if @level > 0
    open(url) do |stream|
      contents =  stream.read
      fetch(links(url, contents))
    end
    pop_d if @level > 0
    @level -= 1
  end