Handle new recipient list format, in which the MESSAGE request has all recipients in it, not just ones local to the responder.
Refactor: change map to reduce.  Remove no-op block for unknown origin.
Remember how reduce works: Provide the updated value for the memo at the end of the block.
Bump libertree-client-rb and libertree-model-rb re: merging dm-remote-recipients .
Merge branch 'master' into ruby-2.0