Removed deprecated tools/version.dart,tools/release/version.dart scripts

tools/version.dart

-#!/usr/bin/env dart
-// 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.
-
-import "dart:io";
-import "dart:async" show getAttachedStackTrace;
-import "release/version.dart";
-
-void main() {
-  Path scriptPath = new Path(new Options().script).directoryPath;
-  Version version = new Version(scriptPath.append("VERSION"));
-  Future f = version.getVersion();
-  f.then((currentVersion) {
-    print(currentVersion);
-  }).catchError((e) {
-    print("Could not create version number, failed with: $e");
-    var trace = getAttachedStackTrace(e);
-    if (trace != null) print("StackTrace: $trace");
-    return true;
-  });
-}