rougenoir 0.1.0

A red-black tree and set with callbacks
Documentation
# TODO

1. Example: interval tree in integration test

## All

1. append
1. replace
1. take
1. get_or_insert/_with (require Entry)

### Good to have maybe

1. Alloc API

## Tree

1. Entry API
1. Range API
1. Bounds

## Set

1. difference
1. intersection/union
1. is_disjoint
1. is_subset/superset