Hi!
According to Jenkins there is one failing test: https://ci.inria.fr/moose/job/roassal/169/ In a fresh 2.0 image, all Roassal's tests pass. I've downloaded the Jenkins image to see what's going on. There is the class RORadialTreeLayout_N. I guess Jenkins is downloading Mathieu package?
Mathieu's work has already been included in Roassal. The class has also been renamed and reworked. No need to install this package.
Cheers, Alexandre