def experiment(name)
      id = name.to_s.downcase.gsub(/\W/, "_").to_sym
      Vanity.logger.warn("Deprecated: Please call experiment method with experiment identifier (a Ruby symbol)") unless id == name
      experiments[id.to_sym] or raise NoExperimentError, "No experiment #{id}"
    end
def experiment(name)
      id = name.to_s.downcase.gsub(/\W/, "_").to_sym
      Vanity.logger.warn("Deprecated: Please call experiment method with experiment identifier (a Ruby symbol)") unless id == name
      experiments[id.to_sym] or raise NoExperimentError, "No experiment #{id}"
    end
Returns the experiment. You may not have guessed, but this method raises
 an exception if it cannot load the experiment's definition.

 @see Vanity::Experiment
 @deprecated