Delete proxy and total samples, which have bit-rotted.

samples/proxy/README

Index: samples/proxy/README
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--- samples/proxy/README	(revision 9011)
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-// Copyright (c) 2012, 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.
-
-This directory contains two experimental ideas. They both introduce an
-abstraction layer on top of isolates and futures to help make the code more
-oblivious of the underlying isolate architecture.
-
-  promise.dart - contains an old example that was based on Promise<T> (an
-                 earlier prototype of Future<T>). Tests based on this code under
-                 'sample/tests/proxy' serve as an illustration of how promise
-                 pipelining could look like.
-
-  proxy.dart - contains an RPC layer that sits on top of isolates and futures.
-               It provides base classes to define client and server rpc stubs.
-               The test 'sample/tests/proxy/MintMakerRpcTest' illustrates how
-               this can be used.