Move a bunch of src/ files into subdirectories.

lib/src/simple_configuration.dart

Index: lib/src/simple_configuration.dart
diff --git a/lib/src/simple_configuration.dart b/lib/src/simple_configuration.dart
deleted file mode 100644
index 470b10f97ed78754c3099b0a76b891a1991d7044..0000000000000000000000000000000000000000
--- a/lib/src/simple_configuration.dart
+++ /dev/null
@@ -1,19 +0,0 @@
-// 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.
-
-library unittest.simple_configuration;
-
-import 'test_case.dart';
-import 'configuration.dart';
-
-/// This is a stub class used to preserve compatibility with unittest 0.11.*.
-///
-/// It will be removed before the next version is released.
-@deprecated
-class SimpleConfiguration extends Configuration {
-  bool throwOnTestFailures = true;
-  SimpleConfiguration() : super.blank();
-
-  String formatResult(TestCase testCase) => "";
-}