mjbellantoni/formtastic-bootstrap — pull request #37 by kristianmandrup (2012-08-10 14:24:52+00:00)
Title: You might wanna check this out ;)

Perhaps a new gem is the way to go, say: formtastic-bootstrap2 for formtastic 2.2 and above support.
Looks like too much trouble to try to support older versions. Too many changes! Your thoughts?