Initial lag chart working, but it's displayed under the health bar atm.
Handle seconds of lag.
Move lag chart and render chart to be visible, got rid of stats.js and made render code use same chart as lag code.
A bit of cleanup, invalidate the DOM less.
Added better handling of extreme values, the chart now flashes red if a value is outside of the representable range.
This should make things a tiny bit faster.
We don't use this anymore.
Merge pull request #68 from crazy2be/lag-chart

Lag chart