Switch pkg packages, pub, and dartdoc to use package: imports.

pkg/scheduled_test/test/scheduled_process_test.dart

 // Copyright (c) 2013, 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 scheduled_process_test;
 
 import 'dart:async';
 import 'dart:io';
 
-import '../../../pkg/pathos/lib/path.dart' as path;
-import '../lib/scheduled_process.dart';
-import '../lib/scheduled_test.dart';
-import '../lib/src/mock_clock.dart' as mock_clock;
+import 'package:pathos/path.dart' as path;
+import 'package:scheduled_test/scheduled_process.dart';
+import 'package:scheduled_test/scheduled_test.dart';
+import 'package:scheduled_test/src/mock_clock.dart' as mock_clock;
 
 import 'metatest.dart';
 import 'utils.dart';
 
 void main() {
   expectTestsPass("a process must have kill() or shouldExit() called", () {
     var errors;
     test('test 1', () {
       currentSchedule.onException.schedule(() {
         errors = currentSchedule.errors;
@@ skipping 358 matching lines @@
 
   currentSchedule.onComplete.schedule(() {
     return tempDir.catchError((_) => null).then((dir) {
       if (dir == null) return;
       return new Directory(dir).delete(recursive: true);
     });
   }, 'clean up temp dir');
 
   return new ScheduledProcess.start(dartExecutable, ['--checked', dartPath]);
 }