add
Date Store.getTimestamp(Object o)
to get the creation timestamp of the object
and
List Store.getTimestapms(Object)
to get timestamps of all available historical versions. This will enable the users to:
1. get the previous version, which is impossible right now
2. Perform operations like daily average, etc. without executing a query for each day.
2008-02-20 04:37:06 UTC in BeanKeeper
