Rename "pathos" package to "path".

pkg/pathos/test/pathos_test.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 'package:unittest/unittest.dart';
-import 'package:pathos/path.dart' as path;
-
-main() {
-  group('path.Style', () {
-    test('name', () {
-      expect(path.Style.posix.name, 'posix');
-      expect(path.Style.windows.name, 'windows');
-    });
-
-    test('separator', () {
-      expect(path.Style.posix.separator, '/');
-      expect(path.Style.windows.separator, '\\');
-    });
-
-    test('toString()', () {
-      expect(path.Style.posix.toString(), 'posix');
-      expect(path.Style.windows.toString(), 'windows');
-    });
-  });
-
-  group('new Builder()', () {
-    test('uses the given root directory', () {
-      var builder = new path.Builder(root: '/a/b/c');
-      expect(builder.root, '/a/b/c');
-    });
-
-    test('uses the given style', () {
-      var builder = new path.Builder(style: path.Style.windows);
-      expect(builder.style, path.Style.windows);
-    });
-  });
-}