Toybuilder: Couchstore

Change-Id: Id6e0b60d5cfdcd8c8dcc47e74eb7b55f9f9488b5
Reviewed-on: http://review.couchbase.org/39171
Reviewed-by: abhinav dangeti <abhinav@couchbase.com>
Tested-by: abhinav dangeti <abhinav@couchbase.com>