Implement a simple replica read command
See http://www.couchbase.com/wiki/display/couchbase/Replica+Read for details on implementation.
This will be experimental functionality for 1.1
Moving to .next until it is decided if this will make it into 1.2 or not.
Michael: this has come up again recently so if possible we'd like to get it in a build for testing soon and see about adding it as experimental, if not supported, in 1.1.3.