[FIX] Tree: Reintroduce preprocessors.#2566

Merged

janezd merged 2 commits intobiolab:masterfrom thocevar:tree

Sep 14, 2017

+15-4

Commits on Sep 8, 2017

Explicitly add preprocessors to the list of parameters in the constructor.
thocevar
committed

Commits on Sep 13, 2017

Add test
astaric
committed