SMTP support

[FuchsiaSoft]

Add support for emailing an aggregated report using SMTP. See #12 for discussion around specifics of what would be included etc., but general gist is:

• Crawl a site completely
• Create an aggregated log of all broken links found
• Email results list over SMTP

simples

(I'll pick this up along with others)

[hmol]

Sounds great 👏

[n3wjack]

I'd leave the emailing of the log/export to something else (Powershell Send-MailMessage for example) in the Unix philosophy of making programs do one thing well. :)
The aggregate log containing all non 200 error codes is interesting however.