parse!

# File railties/lib/commands/plugin.rb, line 587
    def parse!(args)
      options.parse!(args)
      count = 0
      args.each do |uri|
        if Repositories.instance.add(uri)
          puts "added: #{uri.ljust(50)}" if $verbose
          count += 1
        else
          puts "failed: #{uri.ljust(50)}"
        end
      end
      Repositories.instance.save
      puts "Added #{count} repositories."
    end