avl 0.4.3

# AVL Tree Map / Set in Rust

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An ordered map / set implemented with an AVL tree (nearly balanced binary search tree) in Rust.

```rust
use avl::AvlTreeMap;

let mut map = AvlTreeMap::new();
map.insert(0, "zero");
map.insert(1, "one");
map.insert(2, "two");
assert_eq!(map.get(&1), Some(&"one"));
map.remove(&1);
assert!(map.get(&1).is_none());
```

This is solely to get practice with the dark art of unsafe Rust. For all common purposes one of the standard library collections should be preferable.