bidir_iter 0.2.1

Bidirectional iterators
Documentation 
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# Bidrectional iterators

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```rust
use bidir_iter::*;

let a: &[i64] = &[1, 2, 3];
let mut iter = a.bidir_iter();

assert_eq!(iter.next(), Some(&1));
assert_eq!(iter.next(), Some(&2));
assert_eq!(iter.next(), Some(&3));
assert_eq!(iter.prev(), Some(&2));
assert_eq!(iter.prev(), Some(&1));
assert_eq!(iter.prev(), None);
assert_eq!(iter.next(), Some(&1));
```