Fix bug where !team doesn't output p1 driver

if(index) fails if index = 0, even though this is valid.
Now testing if index undefined.
Fix error handler for driverData.addListener

Was handling info, not error
Include example team name in !help for !team
Attempt to clean up domain's err output

Show .stack and .message instead of just err
Announce in channel what race we are covering

Any time the basic race info from leaderboard.json changes,
 let's announce what we are covering.