add support for getl
This feature can give a bunch of new applications for membase server.
"getl" can be used to simulate transactions that membase so lacking today.
One of possible applications for membase with "getl" command is an efficient messages queue in multiple readers / multiple writers scenario. Every writer of the queue will "append" messages and every reader will "getl" accumulated messages and then delete them as one atomic operation.
"getl" will ensure that:
-no messages added (and lost) between getting and deleting.
-only one reader will get messages (no duplicated messages)
Are there any heroes to implement this feature? ;-)