CBTransfer can read replica from couchstore and http://

Currently we can cbtansfer for replica only from sqllite files (i.e. from backup). However, the following command does not work (for couchstore and http://)

Example of couchstore not working for replica

[root@palm-10307 bin]# /opt/couchbase/bin/cbtransfer couchstore-files:///opt/couchbase/var/lib/couchbase/data csv:/tmp/default.5838520c-c744-11e3-99de-6003089eed5e.csv -b default -u Administrator -p password --source-vbucket-state=replica --destination-vbucket-state=replica -i 59
error: only --source-vbucket-state=active is supported by this source: couchstore-files:///opt/couchbase/var/lib/couchbase/data

This request is to improve the cbtransfer to support http:// and couchstore files as well. Would be great to have it for data comparison analysis for our testing.