twitter/bootstrap — pull request #5777 by bradly (2012-11-03 19:59:12+00:00)
Title: Change example email addresses to use RFC 2606 reserved example domain.

first.last@gmail.com could be someone's actually email address, so lets be good internet citizens and use an address we know doesn't belong to anyone.

Spec info: http://tools.ietf.org/html/rfc2606#page-3