App improvements for fall

UIUC is planning to have some in-person classes in the fall, so some students will likely use the bus system. I want new students to have a good experience with my bus app, so I spent yesterday and today making some improvements. I finally fixed a longstanding issue where the app's main screen failed to identify the user's location. I then added a new feature to display a "fingerprint" of each trip in the route trip listings so the user can tell apart variations on and brief diversions from the common route.