OSCache - OSCache 1.6

### Release Notes (5th September, 2001 - by Mike Cannon-Brookes, mike@atlassian.com) Changed the CacheEntry so that it caches Object rather than String (allowing image caching) (Serge Knystautas, sergek@lokitech.com) Cached objects are now serialized to disk so cannot be read by humans anymore (this allows us to cache Object) (Serge Knystautas, sergek@lokitech.com) Added a Servlet 2.3 CacheFilter (and associated response classes) that caches whole requests (Serge Knystautas, sergek@lokitech.com) Minor changes to CacheAdministrator (the way Cache and CacheEntry's are retrieved) - merging Serge and Todd's changes