Rename fletch -> dartino

pkg/os/lib/os.dart

 // Copyright (c) 2015, the Dartino 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.md file.
 
 /// Access to the operating system. Only supported when Dartino is running on a
 /// Posix platform.
 ///
 /// Usage
 /// -----
 /// ```dart
 /// import 'package:os/os.dart';
 ///
 /// main() {
 ///   SystemInformation si = sys.info();
 ///   print('Hello from ${si.operatingSystemName} running on ${si.nodeName}.');
 /// }
 /// ```
 ///
 /// Reporting issues
 /// ----------------
 /// Please file an issue [in the issue
 /// tracker](https://github.com/dartino/sdk/issues/new?title=Add%20title&labels=Area-Package&body=%3Cissue%20description%3E%0A%3Crepro%20steps%3E%0A%3Cexpected%20outcome%3E%0A%3Cactual%20outcome%3E).
 library os;
 
-import 'dart:fletch';
-import 'dart:fletch.ffi';
-import 'dart:fletch.os' as os;
+import 'dart:dartino';
+import 'dart:dartino.ffi';
+import 'dart:dartino.os' as os;
 import 'dart:typed_data';
 import 'package:ffi/ffi.dart';
 
 part 'errno.dart';
 
 part 'net_structs.dart';
 part 'net_structs_android.dart';
 part 'net_structs_linux.dart';
 part 'net_structs_macos.dart';
 part 'net_structs_posix.dart';
 
 part 'system.dart';
 part 'system_linux.dart';
 part 'system_macos.dart';
 part 'system_posix.dart';
 
 abstract class InternetAddress {
   factory InternetAddress(List<int> bytes) = _InternetAddress;
   bool get isIP4;
 }
 
 // TODO(ajohnsen): Take a Duration?
 void sleep(int milliseconds) => sys.sleep(milliseconds);
 int errno() => sys.errno();