def get_method(method_entry)
      path = method_entry.path_name
      File.open(path) { |f| RI::Description.deserialize(f) }
    end
def get_method(method_entry)
      path = method_entry.path_name
      File.open(path) { |f| RI::Description.deserialize(f) }
    end
return the MethodDescription for a given MethodEntry
 by deserializing the YAML