Rename fletch -> dartino

pkg/async_helper/dartino.patch

 diff --git a/../dart/pkg/async_helper/lib/async_helper.dart b/pkg/async_helper/lib/async_helper.dart
 index 37496bc..1b8acf4 100644
 --- a/../dart/pkg/async_helper/lib/async_helper.dart
 +++ b/pkg/async_helper/lib/async_helper.dart
 @@ -27,16 +27,22 @@ library async_helper;
  // 'dart:isolate' (i.e. it is in particular problematic with dart2js).
  // It would be nice if we could use a different mechanism for different
  // runtimes.
 -import 'dart:isolate';
-+import 'dart:fletch';
++import 'dart:dartino';
  
  bool _initialized = false;
 -ReceivePort _port = null;
 +Port _port = null;
  int _asyncLevel = 0;
  
  Exception _buildException(String msg) {
    return new Exception('Fatal: $msg. This is most likely a bug in your test.');
  }
  
@@ skipping 19 matching lines @@
  }
 @@ -63,7 +71,7 @@ void asyncEnd() {
    }
    _asyncLevel--;
    if (_asyncLevel == 0) {
 -    _port.close();
 +    _port.send(null);
      _port = null;
      print('unittest-suite-success');
    }