0.8.2 release

After a day at the office, this is what worked on our population of cars.

1. Add an inlet current derate option (not yet used).
2. Set up the current poller for 50 Hz as well as 60 Hz.
3. It turns out that there are a lot of... naughty cars out there in terms of pilot adherence. We need to be QUITE generous with the current limits. We do not, however, need to allow quite so much time before erring a car.
4. We DO, however, have to reduce the transition delay because some cars don't like seeing a pilot without having the power turned on fairly quickly after they request it...? At least one Leaf seemed to do this, at least.