[vaadin-charts]: ChartConfiguration missing in rc1 jar?

Hi,
I've just downloaded the latest vaadin-charts-3.1.0-rc1.jar.
My Eclipse isn't building because it can't find com.vaadin.addon.charts.model.ChartConfiguration.
It's in the javadocs file, both in the distribution and online.
Has this interface been moved/deprecated?
The current distribution references ChartConfiguration in:
com.vaadin.addon.charts.model.Configuration, so the package look corrupt/inconsistent
Thanks,
Peter
 

Aha, found it in:
  lib/vaadin-charts-model-3.1.0-rc1.jar..that's a new one..
Thanks,
Peter