Move the HTTP library documentation to the README.

pkg/http/lib/http.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /// A composable, [Future]-based library for making HTTP requests.
-///
-/// ## Installing ##
-///
-/// Use [pub][] to install this package. Add the following to your
-/// `pubspec.yaml` file.
-///
-///     dependencies:
-///       http: any
-///
-/// Then run `pub install`.
-///
-/// For more information, see the
-/// [http package on pub.dartlang.org](http://pub.dartlang.org/packages/http).
-///
-/// The easiest way to use this library is via the top-level functions. They
-/// allow you to make individual HTTP requests with minimal hassle:
-///
-///     import 'package:http/http.dart' as http;
-///
-///     var url = "http://example.com/whatsit/create";
-///     http.post(url, body: {"name": "doodle", "color": "blue"})
-///         .then((response) {
-///       print("Response status: ${response.statusCode}");
-///       print("Response body: ${response.body}");
-///     });
-///
-///     http.read("http://example.com/foobar.txt").then(print);
-///
-/// If you're making multiple requests to the same server, you can keep open a
-/// persistent connection by using a [Client] rather than making one-off
-/// requests. If you do this, make sure to close the client when you're done:
-///
-///     var client = new http.Client();
-///     client.post(
-///         "http://example.com/whatsit/create",
-///         body: {"name": "doodle", "color": "blue"})
-///       .then((response) => client.get(response.bodyFields['uri']))
-///       .then((response) => print(response.body))
-///       .whenComplete(client.close);
-///
-/// You can also exert more fine-grained control over your requests and
-/// responses by creating [Request] or [StreamedRequest] objects yourself and
-/// passing them to [Client.send].
-///
-/// This package is designed to be composable. This makes it easy for external
-/// libraries to work with one another to add behavior to it. Libraries wishing
-/// to add behavior should create a subclass of [BaseClient] that wraps another
-/// [Client] and adds the desired behavior:
-///
-///     class UserAgentClient extends http.BaseClient {
-///       final String userAgent;
-///       final http.Client _inner;
-///
-///       UserAgentClient(this.userAgent, this._inner);
-///
-///       Future<StreamedResponse> send(BaseRequest request) {
-///         request.headers['user-agent'] = userAgent;
-///         return _inner.send(request);
-///       }
-///     }
-///
-/// [pub]: http://pub.dartlang.org
 library http;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:typed_data';
 
 import 'src/client.dart';
 import 'src/response.dart';
 
 export 'src/base_client.dart';
@@ skipping 120 matching lines @@
 /// For more fine-grained control over the request and response, use [Request]
 /// instead.
 Future<Uint8List> readBytes(url, {Map<String, String> headers}) =>
   _withClient((client) => client.readBytes(url, headers: headers));
 
 Future _withClient(Future fn(Client)) {
   var client = new Client();
   var future = fn(client);
   return future.whenComplete(client.close);
 }