def method_missing(method_name, *args, &block)
      config = Loquacious::Configuration.for method_name, &block
      raise Adhearsion::Configuration::ConfigurationError.new "Invalid plugin #{method_name}" if config.nil?
      config
    end
def method_missing(method_name, *args, &block)
      config = Loquacious::Configuration.for method_name, &block
      raise Adhearsion::Configuration::ConfigurationError.new "Invalid plugin #{method_name}" if config.nil?
      config
    end
Wrapper to access to a specific configuration object

 Adhearsion.config.foo => returns the configuration object associated to the foo plugin