Correct and improve the ticks on the y axis

The previous syntax was incorrect so the axis options got ignored. This fixes
that and also makes the ticks more useful (multiples of ten in the regen, but
multiples of 50 in the consumption).

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Use time ticks for x axis

This requires another flotchart module but creates a much more pleasant result.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Merge pull request #4 from dirkhh/improveEnergy

Improve energy