* API method to create a new time-limited shared link
* API method for retrieving the current location given a shared link token
* map view that refreshes the current location every 5 seconds

sends an event when a trip is started or ended

new location web hook also includes active trip

closes #22

closes #16 and #15

return `last` location from database instead of filesystem if no `before` param is set

for #15

drops a bunch of duplicate code now that those libraries exist

closes #21

closes #10

closes #11

for #12

closes #4