Support native email address parsing about publicsuffix-ruby

[weppos]

Hi Ben,

I thought a little bit before answering, but I still don't have a definitive answer. Parsing email is a little bit beyond the scope of this library. I've been trying to keep this library as focused as possible on the PSL.

People asked me to add URI validation, email validations, etc, but they are hard businesses and I'm not sure they fit well into this library. For example, addressable should be used if someone wants to parse an URI, instead of a domain.

That said, I would suggest you to provide a patch. If the patch is good enough to be simple, clean and maintainable, I'll keep it into consideration. :)

[benbalter]

I can respect that. Do one thing, do it well. I can't even imagine the number of edge cases and don't want to be the one to maintain it. Pushing the logic to the edge is a better solution. Closing here.

Two follow ups:

1. If relying on PublicSuffix for validation, would you recommend putting something like Addressable in front of it to properly parse the input string?
2. Do you know of anything like addressable for email addresses? Doesn't look like addressable supports 'em.

Edit: email veracity looks like it's a much better approach than my regex.

[benbalter]

@weppos took a pass at this over in benbalter/gman#21. Thanks for the insight. Since it's relying on outside gems, may be able to pull the get_domain method in here if there's interest.