Move the executable's implementation into lib.

lib/src/executable.dart

Index: lib/src/executable.dart
diff --git a/bin/test.dart b/lib/src/executable.dart
similarity index 92%
copy from bin/test.dart
copy to lib/src/executable.dart
index b2eb10f9726d245afff2dd38aecd17e778882989..fe403b2a1f26423aed50fcc52059e55c28de2aba 100644
--- a/bin/test.dart
+++ b/lib/src/executable.dart
@@ -2,7 +2,10 @@
 // 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 test.test;
+// TODO(nweiz): This is under lib so that it can be used by the unittest dummy
+// package. Once that package is no longer being updated, move this back into
+// bin.
+library test.executable;
 
 import 'dart:async';
 import 'dart:io';
@@ -11,13 +14,13 @@ import 'dart:isolate';
 import 'package:args/args.dart';
 import 'package:stack_trace/stack_trace.dart';
 
-import 'package:test/src/backend/test_platform.dart';
-import 'package:test/src/runner/reporter/compact.dart';
-import 'package:test/src/runner/load_exception.dart';
-import 'package:test/src/runner/loader.dart';
-import 'package:test/src/util/exit_codes.dart' as exit_codes;
-import 'package:test/src/util/io.dart';
-import 'package:test/src/utils.dart';
+import 'backend/test_platform.dart';
+import 'runner/reporter/compact.dart';
+import 'runner/load_exception.dart';
+import 'runner/loader.dart';
+import 'util/exit_codes.dart' as exit_codes;
+import 'util/io.dart';
+import 'utils.dart';
 
 /// The argument parser used to parse the executable arguments.
 final _parser = new ArgParser(allowTrailingOptions: true);