Interestingly, the email address comes from the website of Jerkcity. Jerkcity is a webcomic notable enough to have
a Wikipedia page. One of the characters is named Spigot (the name of the committer). Spigot is even based on one of the authors of the strip.
Of course, it's likely that the vandal has nothing to do with Jerkcity, and simply spoofed his name and email address as a bad joke. He's already shown he's very good at covering up his tracks - as Luc noted, he disabled the update hook before his commit and re-enabled it afterward so that no email would be sent to the mailing list.