Move core and coreimpl from corelib/ to lib/core and lib/coreimpl.

corelib/src/strings.dart

Index: corelib/src/strings.dart
diff --git a/corelib/src/strings.dart b/corelib/src/strings.dart
deleted file mode 100644
index a3adffd299aa93fd11665c7a7cadb492737b8c06..0000000000000000000000000000000000000000
--- a/corelib/src/strings.dart
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright (c) 2011, 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.
-
-class Strings {
-  /**
-   * Joins all the given strings to create a new string.
-   */
-  static String join(List<String> strings, String separator) {
-    return StringImplementation.join(strings, separator);
-  }
-
-  /**
-   * Concatenates all the given strings to create a new string.
-   */
-  static String concatAll(List<String> strings) {
-    return StringImplementation.concatAll(strings);
-  }
-}