Move internal design overview to documentation, add examples to README

While the README examples are not checked by rustdoc, they are important
to have as they show-off hyper to the world :)

README.md

@@ -17,6 +17,47 @@ complex web applications written entirely in Rust.
 
 The documentation is located at [http://hyperium.github.io/hyper](http://hyperium.github.io/hyper).
 
+## Example
+
+Echo Server:
+
+```rust
+fn echo(mut incoming: Incoming) {
+    for (_, mut res) in incoming {
+        *res.status_mut() = hyper::status::Ok;
+        let mut res = res.start().unwrap();
+        res.write(b"Hello World!");
+        res.end().unwrap();
+    }
+}
+
+fn main() {
+    let server = Server::http(Ipv4Addr(127, 0, 0, 1), 1337);
+    server.listen(echo).unwrap();
+}
+```
+
+Client:
+
+```rust
+fn main() {
+    // Creating an outgoing request.
+    let mut req = Request::get(Url::parse("http://www.gooogle.com/")).unwrap();
+
+    // Setting a header.
+    req.headers_mut().set(Foo);
+
+    // Start the Request, writing headers and starting streaming.
+    let res = req.start().unwrap()
+        // Send the Request.
+        .send().unwrap()
+        // Read the Response.
+        .read_to_string().unwrap()
+
+    println!("Response: {}", res);
+}
+```
+
 ## Scientific\* Benchmarks
 
 [Client Bench:](./benches/client.rs)
@@ -56,112 +97,6 @@ test result: ok. 0 passed; 0 failed; 0 ignored; 3 measured
 
 \* No science was harmed in the making of this benchmark.
 
-## Internal Design
-
-Hyper is designed as a relatively low-level wrapped over raw HTTP. It should
-allow the implementation of higher-level abstractions with as little pain as
-possible, and should not irrevocably hide any information from its users.
-
-### Common Functionality
-
-Functionality and code shared between the Server and Client implementations can
-be found in `src` directly - this includes `NetworkStream`s, `Method`s,
-`StatusCode`, and so on.
-
-#### Methods
-
-Methods are represented as a single `enum` to remain as simple as possible.
-Extension Methods are represented as raw `String`s. A method's safety and
-idempotence can be accessed using the `safe` and `idempotent` methods.
-
-#### StatusCode
-
-Status codes are also represented as a single, exhaustive, `enum`. This
-representation is efficient, typesafe, and ergonomic as it allows the use of
-`match` to disambiguate known status codes.
-
-#### Headers
-
-Hyper's header representation is likely the most complex API exposed by Hyper.
-
-Hyper's headers are an abstraction over an internal `HashMap` and provides a
-typesafe API for interacting with headers that does not rely on the use of
-"string-typing."
-
-Each HTTP header in Hyper has an associated type and implementation of the
-`Header` trait, which defines an HTTP headers name as a string, how to parse
-that header, and how to format that header.
-
-Headers are then parsed from the string representation lazily when the typed
-representation of a header is requested and formatted back into their string
-representation when headers are written back to the client.
-
-#### NetworkStream and NetworkAcceptor
-
-These are found in `src/net.rs` and define the interface that acceptors and
-streams must fulfill for them to be used within Hyper. They are by and large
-internal tools and you should only need to mess around with them if you want to
-mock or replace `TcpStream` and `TcpAcceptor`.
-
-### Server
-
-Server-specific functionality, such as `Request` and `Response`
-representations, are found in in `src/server`.
-
-#### Request
-
-An incoming HTTP Request is represented as a struct containing
-a `Reader` over a `NetworkStream`, which represents the body, headers, a remote
-address, an HTTP version, and a `Method` - relatively standard stuff.
-
-`Request` implements `Reader` itself, meaning that you can ergonomically get
-the body out of a `Request` using standard `Reader` methods and helpers.
-
-#### Response
-
-An outgoing HTTP Response is also represented as a struct containing a `Writer`
-over a `NetworkStream` which represents the Response body in addition to
-standard items such as the `StatusCode` and HTTP version. `Response`'s `Writer`
-implementation provides a streaming interface for sending data over to the
-client.
-
-One of the traditional problems with representing outgoing HTTP Responses is
-tracking the write-status of the Response - have we written the status-line,
-the headers, the body, etc.? Hyper tracks this information statically using the
-type system and prevents you, using the type system, from writing headers after
-you have started writing to the body or vice versa.
-
-Hyper does this through a phantom type parameter in the definition of Response,
-which tracks whether you are allowed to write to the headers or the body. This
-phantom type can have two values `Fresh` or `Streaming`, with `Fresh`
-indicating that you can write the headers and `Streaming` indicating that you
-may write to the body, but not the headers.
-
-### Client
-
-Client-specific functionality, such as `Request` and `Response`
-representations, are found in `src/client`.
-
-#### Request
-
-An outgoing HTTP Request is represented as a struct containing a `Writer` over
-a `NetworkStream` which represents the Request body in addition to the standard
-information such as headers and the request method.
-
-Outgoing Requests track their write-status in almost exactly the same way as
-outgoing HTTP Responses do on the Server, so we will defer to the explanation
-in the documentation for sever Response.
-
-Requests expose an efficient streaming interface instead of a builder pattern,
-but they also provide the needed interface for creating a builder pattern over
-the API exposed by core Hyper.
-
-#### Response
-
-Incoming HTTP Responses are represented as a struct containing a `Reader` over
-a `NetworkStream` and contain headers, a status, and an http version. They
-implement `Reader` and can be read to get the data out of a `Response`.
-
 ## License
 
 [MIT](./LICENSE)