Root host cookie setup

[itsjhone9]

Hey Devs,

Currently, there is no domain defined to set the traffic source cookie on so it by defaults sets it to hostname but the issue is that if the site contains sub-domains, traffic source cookie fails to follow, instead a new cookie is formed for each domain containing distinct values.

It will be great if the program checks for root host access, and if available set cookie for root domain or else fall back to the hostname.

This in essential in carrying original traffic source data throughout the site and not to worry if its main or sub-domain.