BusStop constructor 
    
      
      BusStop(- {String stopId, 
- String stopCode, 
- String stopName, 
- Null ttsStopName, 
- String stopDesc, 
- double stopLat, 
- double stopLon, 
- String zoneId, 
- String stopUrl, 
- int locationType, 
- Null parentStation, 
- String stopTimezone, 
- int wheelchairBoarding, 
- Null levelId, 
- Null platformCode}
)Implementation
      BusStop(
    {this.stopId,
    this.stopCode,
    this.stopName,
    this.ttsStopName,
    this.stopDesc,
    this.stopLat,
    this.stopLon,
    this.zoneId,
    this.stopUrl,
    this.locationType,
    this.parentStation,
    this.stopTimezone,
    this.wheelchairBoarding,
    this.levelId,
    this.platformCode});