add new emails to disposable yml list

@maj @vanpelt @cchanningallen , there are two places we should be validating emails.  This fulfills the server side validation.  It has been tested locally.

I am not 100% sure if this is the correct way to version a gem, though.
Let's privatize the project.  We have several email validators in several different places already, I'd like to avoid complicating it more.  I'm not sure I have the privileges to privatize, looking into it now.