custom_levels (Log4r::YamlConfigurator)

    # File log4r/yamlconfigurator.rb, line 29
        def self.custom_levels( levels)
          return Logger.root if levels.size == 0
          for i in 0...levels.size
            name = levels[i].to_s
            if name =~ /\s/ or name !~ /^[A-Z]/
              raise TypeError, "#{name} is not a valid Ruby Constant name", caller
            end
          end
          Log4r.define_levels *levels
        end