I think you're right to take offense, this person is blatantly claiming credit for your work. Their repository on Git doesn't even show it was forked from yours

I think you're right to take offense, this person is blatantly claiming credit for your work. Their repository on Git doesn't even show it was forked from yours. I'd suggest you get in touch with GitHub and Elance; they'll probably have one or both accounts suspended, and hopefully they'll abandon the endeavor after that.