Merge to hyperx

[KeenS]

to support hyper 0.12.x, using hyperx will be a good choice.
https://github.com/dekellum/hyperx
and merging this crate to it rather than depending on it would be nice.

[KeenS]

published 0.3.0, which supports hyperx
https://crates.io/crates/www-authenticate/0.3.0

[KeenS]

I'm going to keep it as a separate crate for wait-and-see