Rename fletch -> dartino

tests/ffi/regress_issue_64_test.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.
 
-import 'dart:fletch.ffi';
+import 'dart:dartino.ffi';
 import "package:expect/expect.dart";
 
 main() {
   Foreign memory = new ForeignMemory.allocated(8);
   var bigint = 9223372036854775806;
   memory.setInt64(0, bigint);
   Expect.equals(memory.getInt64(0), bigint);
   memory.setUint64(0, bigint);
   Expect.equals(memory.getUint64(0), bigint);
   memory.free();
 }