feat(lib): redesign API to use Futures and Tokio

There are many changes involved with this, but let's just talk about
user-facing changes.

- Creating a `Client` and `Server` now needs a Tokio `Core` event loop
to attach to.
- `Request` and `Response` both no longer implement the
`std::io::{Read,Write}` traits, but instead represent their bodies as a
`futures::Stream` of items, where each item is a `Chunk`.
- The `Client.request` method now takes a `Request`, instead of being
used as a builder, and returns a `Future` that resolves to `Response`.
- The `Handler` trait for servers is no more, and instead the Tokio
`Service` trait is used. This allows interoperability with generic
middleware.

BREAKING CHANGE: A big sweeping set of breaking changes.

Cargo.toml

@@ -7,49 +7,34 @@ readme = "README.md"
 documentation = "http://hyperium.github.io/hyper"
 repository = "https://github.com/hyperium/hyper"
 license = "MIT"
-authors = ["Sean McArthur <sean.monstar@gmail.com>",
-           "Jonathan Reem <jonathan.reem@gmail.com>"]
+authors = ["Sean McArthur <sean.monstar@gmail.com>"]
 keywords = ["http", "hyper", "hyperium"]
 
 [dependencies]
+futures = "0.1.7"
+futures-cpupool = "0.1"
 httparse = "1.0"
 language-tags = "0.2"
 log = "0.3"
 mime = "0.2"
-rotor = "0.6"
+relay = "0.1"
 rustc-serialize = "0.3"
-spmc = "0.2"
 time = "0.1"
+tokio-core = "0.1"
+tokio-proto = "0.1"
+tokio-service = "0.1"
 unicase = "1.0"
 url = "1.0"
-vecio = "0.1"
 
 [dependencies.cookie]
 version = "0.3"
 default-features = false
 
-[dependencies.openssl]
-version = "0.7"
-optional = true
-
-[dependencies.openssl-verify]
-version = "0.1"
-optional = true
-
-[dependencies.security-framework]
-version = "0.1.4"
-optional = true
-
-[dependencies.serde]
-version = "0.8"
-optional = true
-
 [dev-dependencies]
-env_logger = "0.3"
 num_cpus = "1.0"
+pretty_env_logger = "0.1"
+spmc = "0.2"
 
 [features]
-default = ["ssl"]
-ssl = ["openssl", "openssl-verify"]
-serde-serialization = ["serde", "mime/serde"]
+default = []
 nightly = []