Reorganize code for 0.2.0 release. (#41)

Split the large client/server.dart files into smaller pieces. This is in
preparation for splitting the HTTP/2 dependencies into a separate file
and make it easier to implement other transports.

CHANGELOG.md

@@ -1,11 +1,16 @@
+## 0.2.0 - 2017-12-14
+
+* Implemented support for per-RPC metadata providers. This can be used for
+  authentication providers which may need to obtain or refresh a token before
+  the RPC is sent.
+
 ## 0.1.0 - 2017-10-12
 
 * Core gRPC functionality is implemented and passes
 [gRPC compliance tests](https://github.com/grpc/grpc/blob/master/doc/interop-test-descriptions.md).
 
 The API is shaping up, but may still change as more advanced features are implemented.
 
-
 ## 0.0.1 - 2017-07-05
 
 * Initial version.

interop/pubspec.yaml

@@ -4,7 +4,7 @@ version: 0.0.1
 homepage: https://github.com/dart-lang/grpc-dart
 
 environment:
-  sdk: '>=1.20.1 <2.0.0'
+  sdk: '>=1.24.3 <2.0.0'
 
 dependencies:
   args: ^0.13.0

lib/grpc.dart

@@ -2,8 +2,20 @@
 // 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.
 
-export 'src/client.dart';
-export 'src/server.dart';
-export 'src/shared.dart';
-export 'src/status.dart';
-export 'src/streams.dart';
+export 'src/client/call.dart';
+export 'src/client/channel.dart';
+export 'src/client/client.dart';
+export 'src/client/common.dart';
+export 'src/client/connection.dart';
+export 'src/client/method.dart';
+export 'src/client/options.dart';
+
+export 'src/server/call.dart';
+export 'src/server/handler.dart';
+export 'src/server/server.dart';
+export 'src/server/service.dart';
+
+export 'src/shared/security.dart';
+export 'src/shared/status.dart';
+export 'src/shared/streams.dart';
+export 'src/shared/timeout.dart';