Deal with extensions at the bucket level.
Deal with extensions at the bucket level.

Change-Id: I7ac9d89bbaa5e01b43b9443bc145d607db9e9a0a
Reviewed-on: http://review.northscale.com/1464
Reviewed-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>
Tested-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>

membase/bucket_engine,couchbase/bucket_engine,membase/bucket_engine,membase/bucket_engine,couchbase/bucket_engine,couchbase/bucket_engine,membase/bucket_engine,couchbase/bucket_engine