JCBC-240 Add total number of rows in ViewResponse

Change-Id: I82bcb65e48e3d6fde8d5361ee242f89960d38a6f
Reviewed-on: http://review.couchbase.org/25027
Reviewed-by: Michael Nitschinger <michael.nitschinger@couchbase.com>
Tested-by: Michael Nitschinger <michael.nitschinger@couchbase.com>