Rename fletch -> dartino

src/vm/hash_set.h

 // 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.
 
 #ifndef SRC_VM_HASH_SET_H_
 #define SRC_VM_HASH_SET_H_
 
 #include "src/vm/hash_table.h"
 
-namespace fletch {
+namespace dartino {
 
 template <typename Key>
 struct SetKeyExtractor {
   static Key& GetKey(Key& key) {  // NOLINT
     return key;
   }
 
   static const Key& GetKey(const Key& key) { return key; }
 };
 
 // UnorderedSet:
 // Interface is kept as close as possible to std::unordered_map, but:
 // * Only functions that can be expected to be tiny are inlined.
 // * The Key type must be memcpy-able and castable to void* and the same size.
 // * The hash code is just a cast to int.
 // * Not all methods are implemented.
 // * Iterators are invalidated on all inserts, even if the key was already
 //   present.
 // * Google naming conventions are used (CamelCase classes and methods).
 template <typename Key>
 class HashSet : public UnorderedHashTable<Key, Key, SetKeyExtractor<Key>> {};
 
-}  // namespace fletch
+}  // namespace dartino
 
 #endif  // SRC_VM_HASH_SET_H_