Remove now-useless array of classes from Aggregator.

  # class.

  class Aggregator

    def initialize

      @documentation = []

      @classes = {}

      @alt_names = {}

      @orphans = []

        @current_class = old_cls

      else

        @current_class = cls

        @documentation << cls

        @classes[cls[:name]] = cls

        # Register all alternate names of class for lookup too

            # it by merging the class with alt-name into this class.

            if @classes[altname]

              merge_classes(cls, @classes[altname])

              @documentation.delete(@classes[altname])

              @classes.delete(altname)

              warn_alt_name(cls)

            end