Fstumbler

- added core/special_tree()
- added node/node.ll_count()
- fixed bug in core/tumble() from e4cc039
- documented core/tumble() and core/tree()

**Full Changelog**: https://github.com/fybx/fstumbler/compare/v1.0.0...v1.1.0

initial release 🚀

**Full Changelog**: https://github.com/fybx/fstumbler/commits/v1.0.0