Revert "Fix Haml::Utils.av_template_class for latest rails"
Revert "Fix Haml::Utils.av_template_class for latest rails"

This reverts commit 712e609a343f541886c69f856914d312d3fcfa27.

keithpitty/haml,haml/haml,keithpitty/haml,haml/haml,concord-consortium/haml,stanhu/haml,dg1dd1ngs/haml,haml/haml,macressler/haml,tangposmarvin/haml,haml/haml,amatsuda/haml,sideci-sample/sideci-sample-haml,uniba/hamldoc_ja,tangposmarvin/haml,nazar-pc/haml,dg1dd1ngs/haml,stanhu/haml,nazar-pc/haml,macressler/haml