Fix ParticipantList bug

participant_list.rb

require 'ruote/svc/participant_list'
class Ruote::ParticipantList

  def instantiate_with_arg_normalization pinfo, opts={}
    pinfo = [pinfo, {}] if pinfo.is_a?(String) # This will get all breaky if we ever pass options to the participant definition
    instantiate_without_arg_normalization(pinfo, opts)
  end
  alias_method_chain :instantiate, :arg_normalization
end