Note that we sort indices, not points.
Narrate up to find_child_bounds
No need for zip_iterator inside of classify_children.
classify_children doesn't need to take children as a parameter.
narrate through classification
Narrate through enumerate_nodes_and_leaves
small edit
A small change to exercise.cu which provides a bit of clarity
narrate though creating the leaves
Finish up the README
Merge remote-tracking branch 'upstream/master'