Added RoofedForest trees.

Could still be improved a lot.

![2014-07-30_15 56 53](https://cloud.githubusercontent.com/assets/1160867/3749985/628a4494-17f1-11e4-96c8-39422f086023.png)
I have not yet upgraded to xoftsyntax™ v5.98, still on v5.90.

Strange, considering that I am the "everything cutting bleeding edge evangelist".