core: added items() and iteritems() methods to PersistentDict

src/memory/persistent.py

@@ -53,6 +53,12 @@ class PersistentDict(object):
             d = self.storage.loadIndPrivates(self._cache, self.namespace, self.profile)
         return d.addCallback(lambda dummy: self)
 
+    def iteritems(self):
+        return self._cache.iteritems()
+
+    def items(self):
+        return self._cache.items()
+
     def __repr__(self):
         return self._cache.__repr__()