Provide real-time tracking and timetable for Boston transportation (bus/metro/train/tram)

Features:
1. Nearby Stops
- Provide all nearby bus stops sorted by the distance from current location
- Click on a specific bus stop to display all bus routes via the stop
- Click on a specific route to further display all stop sequence and their estimated arrival times
- By clicking on a specific stop, you can further explore the stop nearby POI things.

2. Bus Routes Information
- Searching specific bus information by using route number, stop number, or partial stop name
- Provide recently used bus route for quickly selection.