Rename fletch -> dartino

src/vm/hash_map.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_MAP_H_
 #define SRC_VM_HASH_MAP_H_
 
 #include "src/vm/hash_table.h"
 
-namespace fletch {
+namespace dartino {
 
 template <typename Key, typename Mapped>
 struct MapKeyExtractor {
   static Key& GetKey(Pair<Key, Mapped>& pair) {  // NOLINT
     return pair.first;
   }
 
   static const Key& GetKey(const Pair<Key, Mapped>& pair) { return pair.first; }
 };
 
@@ skipping 21 matching lines @@
   }
 
   MappedType& At(const Key& key) {
     char* mapped = this->map_.At(reinterpret_cast<const void*>(key));
     // The original API throws an exception, but we don't use exceptions.
     ASSERT(mapped != NULL);
     return *reinterpret_cast<MappedType*>(mapped);
   }
 };
 
-}  // namespace fletch
+}  // namespace dartino
 
 #endif  // SRC_VM_HASH_MAP_H_