Implement Ticket class and TicketTest to validate Ticket.

1. Ticket class which is data model to represent user's number ticket for a specific store.
    - only private constructor and need to create this object via instanceOf static function since all data should be read from JSON text sent from server
    - getter functions for member variables
    - regTime is Date format which is converted from UTC format string sent from server.

 2.TicketTest which is JUnit3 test class to validate Ticket class.