Fix pip install issue #13 + TGV max #17

Change user-agent to avoid error 400 (issue #11)

Add SNCF Avantage cards

Fix issue #8

Fix issue #4

Add TGVMax support

Removed pandas package dependency

Fixed problem with some belgian trains (issue #1)

Fixed the 'stations_mini.csv does not exist' problem

Added get_station_id and CLI tool