switching to narwhal modules instead of nodejs

node.js modules require quite many functionality to be provided by
environment. No time to implement it now, so using narwhal that
has less deps

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jollamobile.com>
unti tests: util

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jollamobile.com>
removing redundant functionality

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jollamobile.com>