Add 'instances' to the supported methods in the assignmapper extension

I am using 'instances' to do Result-Set Mapping and found it useful to add it to the monkeypatch list in assign_mapper:

--- assignmapper.py     (revision 2230)
+++ assignmapper.py     (working copy)
@@ -34,7 +34,7 @@
         extension = ctx.mapper_extension
     m = mapper(class_, extension=extension, *args, **kwargs)
     class_.mapper = m
-    for name in ['select', 'select_by', 'selectone', 'get_by', 'join_to', 'join_via', 'count', 'count_by', 'options']('get',):
+    for name in ['select', 'select_by', 'selectone', 'get_by', 'join_to', 'join_via', 'count', 'count_by', 'options']('instances','get',):
         monkeypatch_query_method(ctx, class_, name)
     for name in ['delete', 'expire', 'refresh', 'expunge', 'merge', 'save', 'update', 'save_or_update']('flush',):
         monkeypatch_objectstore_method(ctx, class_, name)

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