Roll Observatory packages and add a roll script

path/lib/src/characters.dart

Index: path/lib/src/characters.dart
diff --git a/path/lib/src/characters.dart b/path/lib/src/characters.dart
deleted file mode 100644
index ff196a6722596dec232eba9976a5b151999e42d2..0000000000000000000000000000000000000000
--- a/path/lib/src/characters.dart
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@@ -1,19 +0,0 @@
-// Copyright (c) 2014, 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 library contains character-code definitions.
-library path.characters;
-
-const PLUS = 0x2b;
-const MINUS = 0x2d;
-const PERIOD = 0x2e;
-const SLASH = 0x2f;
-const ZERO = 0x30;
-const NINE = 0x39;
-const COLON = 0x3a;
-const UPPER_A = 0x41;
-const UPPER_Z = 0x5a;
-const LOWER_A = 0x61;
-const LOWER_Z = 0x7a;
-const BACKSLASH = 0x5c;