code: function(transportType, formatter) {
  
      var exists = contains( cm.config.easylogger.transports
                           , { "key": "type", "value": transportType }
                           , "exists"
                           )
      // It is needed because transport type begins whit upper case if you add a new instance
      // but, in object, its property is saved beggining with lower chase
      var firstChar = transportType.charAt(0)
      transportType = transportType.replace(firstChar, firstChar.toLowerCase())
  
      if (exists) logger.transports[transportType].formatter = formatter
    }
docs: Set custom formatter to trasnsports transportId : transport type where apply formatter formatter : function to format messages