ResourceManager::~ResourceManager()
{
   clear();

   // Release resource types
   map< int, ResourceRegEntry >::const_iterator itr = _registry.begin();
   while( itr != _registry.end() )
   {
      if( itr->second.initializationFunc != 0x0 )
         (*itr->second.initializationFunc)();

      ++itr;
   }
}