Fix bar width and adjust colors to be more "Tesla-like"

This adds jet another module, but for very good effect, I think.
We now do the energy graph in two colors for regen and energy spent.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Merge pull request #5 from dirkhh/improveEnergy

Fix bar width and adjust colors to be more "Tesla-like"