def set(option, value=(not_set=true), ignore_setter=false, &block)
      raise ArgumentError, 'value not set' if block and !not_set
      return self if !not_set and value.nil?

      if not_set
        set_options option
        return self
      end

      if respond_to?("#{option}=") and not ignore_setter
        return __send__("#{option}=", value)
      end

      define_accessors option, value
      self
    end
def set(option, value=(not_set=true), ignore_setter=false, &block)
      raise ArgumentError, 'value not set' if block and !not_set
      return self if !not_set and value.nil?

      if not_set
        set_options option
        return self
      end

      if respond_to?("#{option}=") and not ignore_setter
        return __send__("#{option}=", value)
      end

      define_accessors option, value
      self
    end
Set a configuration option for a given namespace

 @param [String] option
 @param [Object] value
 @param [Boolean] ignore_setter

 @return [self]

 @api public