This upgrade Hyper to v0.12 and updats to code to work for it. It has
being done with the minimum code change and so the logic is still
aukward for the futures model. This should be addressed in later commits
but I did not want to compilcate an already large commit.
Use the power of the `AsRef` trait to take generic parameters for
several API functions. This makes the API more ergonomic because the
callers may pass in static `str` slices or references to owned `String`s
or even more exotic things like a `Cow`, all based on their particular
situation.
Update the tests and examples to use the most natural types they have
available.
Fixes#77. No existing code should break, as `&String` implements
`AsRef<str>` and `AsRef<Path>`
This is a breaking change; it's supposed to fix#1. Also, it's a
proposal -- not sure if the benefits outweigh the cost of this.
The example/auth.rs binary is not broken by this, as it doesn't use the
API that changed. The tests have been updated accordingly.
I mainly resolved some circular dependencies that had crept in, and
moved code around. I renamed helper.rs because that was not really an
appropriate name anymore, and moved the delegate code into a new module.
