Move cars to separate endpoint
Update Car model: use keys and remove Ancestor
Add update task to scrape Twitter

* Add Bot for credentials and last updated
* Add Action and Updated to Car to note Twitter update
* Add Driver to note user's current Car
Let Car has Command as ancestor, use transactions

* Use transaction on update task
Add updateCommand task

* Save update time to Command
* Update parking using Car Actions
Add spot suggestion with sort
Send tweet for all updates
Merge branch 'go-remodel' into go
Add basic driver API (update current car)