Quick fix: Disable RevisionStorage tests.

As the earlier comment indicated, this storage does not support
multiple revisions.  The RevisionStorage tests changed to require
revision support, so the tests now fail.  This might be the right
long-term strategy, but it needs a little thought.

tests/testTemporaryStorage.py

@@ -9,7 +9,7 @@ from ZODB.tests import StorageTestBase, BasicStorage, \
 
 class TemporaryStorageTests(
     StorageTestBase.StorageTestBase,
-    RevisionStorage.RevisionStorage, # not a revision storage, but passes
+##    RevisionStorage.RevisionStorage, # not a revision storage, but passes
     BasicStorage.BasicStorage,
     Synchronization.SynchronizedStorage,
     ConflictResolution.ConflictResolvingStorage,