This module allows you to get the public suffix, as well as the registrable
domain, of a domain name using the Public Suffix List from publicsuffix.org.

A public suffix is a domain suffix under which you can register domain names,
such as .com, .co.uk, and pvt.k12.wy.us. Accurately knowing the public suffix
of a domain is useful when handling web browser cookies, highlighting the most
important part of a domain name in a user interface, or sorting URLs by site.

The module builds the public suffix list as a Trie structure, and includes a
bundled copy of the list so it is usable out of the box. The code is a fork
of the publicsuffix package and uses the same API.
