First stab at some driving statistics

This still hardcodes the capacity of the car. Need to parse this from the
initial response from the Tesla server.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Remove debug output that made it into an earlier commit

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Add charging and temperature details to the database

This causes load on the Tesla server - so be very careful with the timeout
used for the calls to getAux()

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>