Bump version 1.3.6

Change-Id: Ifea4a2d38d180b8b2529096dcee762dd080e738e
Reviewed-on: http://review.couchbase.org/33613
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>