kstring 0.1.0

Key String: optimized for map keys
Documentation 
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KString
===========

> Key String: Optimized for map keys.

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## Background

Considerations:
- Large maps
- Most keys live and drop without being used in any other way
- Most keys are relatively small (single to double digit bytes)
- Keys are immutable
- Allow zero-cost abstractions between structs and maps (e.g. no allocating
  when dealing with struct field names)

Ramifications:
- Inline small strings rather than going to the heap.
- Preserve `&'static str` across strings (`KString`),
  references (`KStringRef`), and lifetime abstractions (`KStringCow`) to avoid
  allocating for struct field names.
- Use `Box<str>` rather than `String` to use less memory.

## License

Licensed under either of

 * Apache License, Version 2.0, (http://www.apache.org/licenses/LICENSE-2.0)
 * MIT license (http://opensource.org/licenses/MIT)

at your option.

### Contribution

Unless you explicitly state otherwise, any contribution intentionally
submitted for inclusion in the work by you, as defined in the Apache-2.0
license, shall be dual licensed as above, without any additional terms or
conditions.