def rake_merge_option(args, defaults)
      if Hash === args.last
        defaults.update(args.last)
        args.pop
      end
      args.push defaults
      args
    end
def rake_merge_option(args, defaults)
      if Hash === args.last
        defaults.update(args.last)
        args.pop
      end
      args.push defaults
      args
    end
Merge the given options with the default values.