Rename "pathos" package to "path".

pkg/path/test/posix_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.
 
-library pathos_posix_test;
+library path.test.posix_test;
 
 import 'package:unittest/unittest.dart';
-import 'package:pathos/path.dart' as path;
+import 'package:path/path.dart' as path;
 
 main() {
   var builder = new path.Builder(style: path.Style.posix, root: '/root/path');
 
   if (new path.Builder().style == path.Style.posix) {
     group('absolute', () {
       expect(path.absolute('a/b.txt'), path.join(path.current, 'a/b.txt'));
       expect(path.absolute('/a/b.txt'), '/a/b.txt');
     });
   }
@@ skipping 396 matching lines @@
 
   test('toUri', () {
     expect(builder.toUri('/path/to/foo'), Uri.parse('file:///path/to/foo'));
     expect(builder.toUri('/path/to/foo/'), Uri.parse('file:///path/to/foo/'));
     expect(builder.toUri('/'), Uri.parse('file:///'));
     expect(builder.toUri('foo/bar'), Uri.parse('foo/bar'));
     expect(builder.toUri('/path/to/foo#bar'),
         Uri.parse('file:///path/to/foo%23bar'));
   });
 }